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We just got back from a cruise on the Constellation, and dove in St. Thomas. Underwater Safaris was the company that provided the ship-booked SCUBA excursion and where we went (Rye Reef) had some snorkel boats there.
The dive was nice, though I was a bit disappointed in the dive boat service. Nothing but water from a 1-gal bottle on board, though they offered to let us run into a store at the pier to buy somehting to bring with us. No snacks between dives, and we did 2 dives at the same site (reef and a very close wreck). For the $100+/per person without equiptment, I expected a bit more. The staff was nice and we had a good divemaster, though they let you know very clearly at the end that tips were expected.
All that said, it was a nice trip, and very easy (the shop and boat are at the cruise ship pier). Call the shop and ask if they are the operator for your cruise and ask about brining a snorkeler.
St Thomas Dive Club @ Bolongo Bay takes both snorklers & divers to Buck Island, they will also pick you up if ship is at WICO and drop to off afterward for free. The dive shop is next to Bologo Bay Beach Resort and you can lay out by the beach and buy drinks at the bar after diving. We have used them 3 times. If the ship is at Crown Bay we use blue island divers (used them once), they go to Flat Cay & a wreck.