We were just on the Carnival Triumph to the eastern carribbean this year from July 5th-July 12th and had an AWESOME time!! I think you should really look into snorkeling... We went snorkling in St. Thomas through carnival. We booked our tickets aboard, and @ 8am we met outside the ship and got onto a tour bus that took us to the beach with others to begin our snorkling. We snorkled along the beach in St. Thomas about 15 minutes away from the ship. It was SO much fun, I highly reccomend it! I'm 16 and loved it! My parents enjoyed it also. We saw so many kinds of tropical fish and got to feed them. Not once did we see a shark. They told us that sharks don't normally come in the shallow waters of the beach, not many of us went too far out. The excursion lasted 3 hours, wish is was longer!! Have fun with what ever you choose to do tho!!