Private Fast Power Catamaran. Full or Half Day for Beach Hopping, Snorkel & Swim

The best island day starts offshore. This private St. Thomas charter lets you shape the day around swimming, snorkeling, beach bars, and quiet coves aboard MV Poseidon, a roomy 36-foot TwinVee power catamaran. I like the boat’s speed and steady ride, and I like having a captain who can adjust the route to suit your group. The catch is cost: the $895.50 boat price covers up to 12 people, but fuel and gratuity add to the final bill.

I also like the freedom to skip the fixed group-boat routine. You can swim with turtles, stop at a beach for a drink, play your own music, and choose how active or lazy the day feels. Just do not expect to visit every beach listed in the sample route. Even on a full-day outing, rough water, travel time, and your chosen stops may limit you to about three locations.

The quick take

• A private 36-foot power catamaran: MV Poseidon carries up to 12 people, giving families and groups room to spread out without sharing the boat with a large crowd.
• Your captain builds the route with you: Captains such as Holly, Glen, Wallens, Amanda, Aaron, Mike, Bryan, and Hillary have shaped outings around snorkeling, beach time, children, and sightseeing.
• Strong snorkeling potential: The equipment is provided, and past outings have included turtles, tropical fish, coral, stingrays, starfish, an octopus, and even a lemon shark.
• Beach bars are part of the fun: The boat’s low draft and transom ladder let you get close to shore at places such as Dinghy’s, Margaritaville, Lime Out, and Lovango.
• Fuel is extra: Expect an added fuel charge of about $120 to $200 for a half-day or $240 to $360 for a full day, based on the stated fuel use.
• Half-day or full-day flexibility: The experience lasts about four to seven hours, but arriving late can cut into your time on the water.

Setting out from Red Hook on MV Poseidon

You meet at American Yacht Harbor on Smith Bay Road in Red Hook, on St. Thomas’s east end. The charter returns to the same harbor, which makes the arrangement fairly simple if you are staying near Red Hook or arranging your own transportation from elsewhere on the island.

MV Poseidon is a 2019, 36-foot TwinVee Ocean Cat. This is a power catamaran, not a slow sailing catamaran, so the boat is built to cover ground between St. Thomas, St. John, and nearby anchorages. The twin-hull design also gives you a steadier ride than a narrow single-hull boat, though no boat can make rough Caribbean water perfectly smooth.

The boat accommodates up to 12 people. That capacity is the key to the price. For a group of 10 or 12, the base cost works out to about $75 to $90 per person before fuel and tip. For four people, the same charter costs roughly $224 per person before those extras, so the value is much better for a larger family or group of friends.

The captain begins with a safety briefing and then asks what your group wants to do. That simple conversation matters. You can explain that you want three snorkel stops, a quiet beach, lunch, turtle viewing, or mostly cruising and swimming. Captains Wallens, Holly, Amanda, Aaron, Mike, Bryan, Glen, and Hillary have all been praised for mixing local knowledge with a relaxed, personal approach.

How the custom route really works

The long list of possible stops can look ambitious. Water Island, Little Buck Island, Secret Harbour, Honeymoon Beach, Trunk Bay, Scott Bay, Maho Bay, and Magens Bay are spread across a wide area, so you should treat them as choices, not a promise to visit them all.

Your captain will choose a practical route based on weather, sea conditions, your priorities, and the time you book. On a half-day trip, two or three meaningful stops make more sense than racing from beach to beach. On a full-day trip, you have more room for St. John, a longer lunch stop, or several swims, but even then you may only see a few places.

That flexibility is one of the charter’s best features. A family with young children can favor a beach where a toddler can play. Strong swimmers can ask for more snorkeling. A group celebrating a birthday can spend more time at a beach bar. You are not locked into the pace of a large excursion boat.

The tradeoff is that the quality of the day depends partly on communication. Arrive at least 15 minutes before departure so paperwork does not reduce your time. Tell the captain early what matters most, then accept that the final route may change.

Water Island and Little Buck Island

Water Island makes a sensible early stop when your group wants a short swim, a look at the coast, or a gentle start to the day. Its position near St. Thomas can work well when you do not want to spend the first part of a half-day charter traveling a long distance.

Little Buck Island is especially appealing for snorkeling. The area gives you a chance to see underwater life without committing the entire day to one beach. The boat includes new snorkeling equipment, water, ice, soda, and beer, so you can get in the water without arranging gear on your own.

Conditions matter here. Fish and coral are not guaranteed on every visit, and visibility can change. One outing may feel like snorkeling in an aquarium, with turtles and many species of fish, while another may offer beautiful water and turtles but fewer fish. That is normal in the sea, not a fault you can eliminate with a schedule.

Secret Harbour and Honeymoon Beach

Secret Harbour works well for a quieter swim and a break from the more famous beach stops. It is the kind of place where the boat can give you a pleasant change of pace, especially if your group wants less sightseeing and more time in the water.

Honeymoon Beach is useful for mixed-age groups. The boat’s low draft and stern ladder allow the captain to bring you close to shore, so younger children or less confident swimmers can spend time on the beach while stronger swimmers explore nearby water.

That short step from boat to beach is more valuable than it sounds. You avoid the fuss of finding a separate landing place, and your group can split up without losing the boat as a base. The captain can help you decide how long to stay, though a half-day charter forces you to watch the clock.

Trunk Bay and Scott Bay

Trunk Bay is one of St. John’s famous beach destinations, with clear water and strong appeal for swimming and snorkeling. A stop here can be a highlight, but it may also be busier than smaller coves. If your group wants the classic St. John beach experience, it deserves consideration.

Scott Bay offers another chance to look for fish and coral away from a heavily visited shoreline. The appeal of the private charter is that you can ask your captain to favor places that fit the conditions on the day, rather than following a fixed group schedule.

The boat is well suited to a snorkel-focused day around St. John. One family with children ages 5 and 7 managed three beach stops in a half-day and saw fish and sea turtles. Another family of four used the boat for St. John snorkeling and found turtles, starfish, stingrays, tropical fish, and a sunken sailboat.

Maho Bay and Magens Bay

Maho Bay is a strong choice if swimming with sea turtles is high on your list. The shallow, inviting setting can also help people who are nervous about open water. One older family member who normally avoided adventurous water activities felt comfortable getting in here, which says something about the stop’s broad appeal.

Still, wildlife is never guaranteed. The turtles may appear, while fish stay hidden, or the water may be stirred up by wind and boat traffic. Go for the chance to see marine life, not a promised checklist.

Magens Bay is one of St. Thomas’s best-known beaches and offers a scenic finish when your group wants sand, swimming, and a classic island view. It can be a good choice for a first visit to St. Thomas, though the beach’s popularity may make it less peaceful than a smaller stop.

Your captain’s local judgment matters most at these locations. Captains Amanda and Wallens have received especially strong praise for explaining island geography, history, and sea life while also keeping safety in view. Captain Holly has also been singled out for her friendly manner and strong understanding of the islands.

Snorkeling with turtles, fish, and coral

Snorkeling is the heart of this charter for many groups. The operator supplies masks, snorkels, and related equipment, so you do not need to pack a full kit. You still need to be comfortable in the water and ready to follow the captain’s safety instructions.

The marine life can be excellent. Outings have included sea turtles, coral beds, tropical fish, stingrays, starfish, an octopus, and a lemon shark viewed from a safe distance. The most realistic expectation is a good chance to see something interesting, not a guarantee of every animal listed.

I like that the captain can choose among several areas. If one location has poor visibility, rough water, or fewer fish, the group may be able to try another. A fixed excursion cannot always make that adjustment.

Families should discuss swimming ability before boarding. The charter can suit children, and captains have worked well with kids as young as five, but the water is still open water. A half-day is often enough for a family with younger children, while adults and confident swimmers may prefer seven hours.

Beach bars, lunch, music, and the easygoing side

This is not only a snorkeling trip. The boat can bring you close to shore for a drink or meal at places such as Dinghy’s, Margaritaville, Lime Out, or Lovango. Several outings included time at Lovango for lunch and drinks, and that stop was a highlight for groups wanting a break from swimming.

Food and paid drinks at shore stops are not listed as included, so plan to pay separately. The included beverages on the boat are water, soda, and beer. You also get ice, which helps keep the day simple and comfortable.

MV Poseidon has a FUSION stereo, and music is part of the experience. You can listen to your own tunes while cruising or relaxing at anchor, which gives the charter a more personal feel than a standard sightseeing boat.

The best day usually mixes activity and idleness. You might snorkel early, stop at a beach bar for lunch, then spend the final hour swimming or listening to music. Do not fill every minute with stops. The ride itself, with views of the volcanic islands and brilliant Caribbean water, is part of the pleasure.

The real price, including fuel and tip

The advertised price is $895.50 for the entire boat, with up to 12 people included. That is a reasonable arrangement for a large group because you are paying for privacy, a captain, equipment, drinks, and the ability to shape the route.

Fuel is extra at $8 per gallon. The stated average use is 15 to 25 gallons for a half-day, or 30 to 45 gallons for a full day. That puts the likely fuel charge at:

• Half-day: about $120 to $200
• Full-day: about $240 to $360

A 15 to 20 percent tip for the captain is recommended and is not included. On the base price alone, a group of 12 pays about $75 per person. After a typical half-day fuel charge and a 15 percent tip on the base charter, the rough total becomes about $1,150 to $1,230, or approximately $96 to $103 per person for 12 people.

For a small group, the arithmetic is less favorable. Four people would pay roughly $288 to $308 each under that same half-day estimate. I would book this for the privacy and control, not because it is the cheapest way to get on the water.

Rough water, cancellations, and practical limits

This experience depends on good weather. If poor conditions force a cancellation, you can choose another date or receive a full refund. You can also cancel for a full refund if you do so at least 24 hours before the start time. Changes or cancellations inside that 24-hour window are not accepted for a refund.

The water can be rough. One full-day outing managed only three stops because conditions made the route slower and less comfortable. A good captain will read the sea and adjust, but you should not plan the day around visiting every named beach.

The operator confirms bookings within 48 hours, subject to availability. Service animals are allowed, the meeting point is near public transportation, and most people can participate. Since this is a private activity, only your group shares the boat.

Who should book this charter?

I would choose MV Poseidon for a family reunion, a group of friends, or a cruise-port day when privacy matters. It is particularly good for people who want to combine snorkeling with beach bars, lunch, and music instead of spending every minute on a formal sightseeing route.

It also suits mixed groups. Children can enjoy a beach stop, confident swimmers can snorkel, and adults who mainly want scenery and drinks can stay aboard. Captains have been praised for being patient with children and reassuring with people who feel uneasy in deep water.

I would think twice if your group has only two or three people and is focused mainly on saving money. I would also avoid booking a half-day if your wish list includes St. Thomas, St. John, several beaches, lunch, and long snorkeling sessions. You will have to choose.

Should you book MV Poseidon?

Book it if you have a larger group and want a private, flexible day on the water. The strongest reasons are the roomy power catamaran, the capable captains, the included snorkeling gear and drinks, and the ability to change the plan as the day unfolds.

Choose the full-day option if snorkeling and beach hopping are your main vacation goals. Pick the half-day if you have young children, limited time, or want one good swim and a beach-bar stop without giving up an entire day.

Before paying, budget for fuel and a 15 to 20 percent tip, arrive early, and agree on your top two or three priorities with the captain. If you can accept changing sea conditions and a shorter stop list, this charter offers one of the most personal ways to experience St. Thomas and St. John.

FAQ

Where does the private catamaran charter depart?

The charter departs from American Yacht Harbor at 84GX+24H, Smith Bay Road, Red Hook, St. Thomas, USVI. It returns to the same meeting point.

How long does the experience last?

The outing lasts approximately four to seven hours. The half-day option is about four hours, while the full-day option lasts longer.

How many people can ride on MV Poseidon?

The private charter accommodates up to 12 people. The price applies to the entire boat, not to each individual passenger.

Is snorkeling equipment included?

Yes. Snorkeling equipment is included, along with bottled water, soda, ice, and beer.

Is fuel included in the price?

No. Fuel is billed at $8 per gallon. Average use is 15 to 25 gallons for a half-day and 30 to 45 gallons for a full day.

Can the charter visit the British Virgin Islands?

A visit to the British Virgin Islands is not included in this experience. It can be booked separately under product code 111649P25.

What happens if bad weather cancels the trip?

If poor weather causes the cancellation, you can receive a full refund or select a different date. You may also cancel for a full refund at least 24 hours before the scheduled start time.