LeeAnne
There is a motorized 100 passenger speed catamaran in St. Thomas called the Wild Thing. That is a totally wild ride and completely circles St. Thomas with a stop at Megans Bay for swimming, snorkeling and relaxing.. It leaves the dock playing the song by the Trogs at top volume.
If you make it to that part of the world, you ought to see if it's available. That was the one of the best days of my 2002 Millennium Cruise.