Yes, the snorkle adventures are quite fun and there is always the rum! cheer In Curacao, our snorkel tour onboard the "Miss Ann", they served a local dutch pastry and sliced watermelon in addition to the rum punch.
Today is a Sea Day; however yesterday we were in Grand Turk. There is a fantastic Cruise Center right off the pier with chairs along a nice stretch of beach, an actual pool, some water park type activities, lockers, shopping stores, and even very clean restrooms. There was also a Margaritaville restaurant with some fun island music. Since we knew there were all of these ammenities, we did not sign up for a tour. We had brought our own snorkeling equipment (well worth the investment if you like to snorkel), so tried it out along the beach and much to our surprise there was plenty to see right there off the coast line.
The Navigator, March 11th sure sounds "FUN". :)

"One's destination is never a place, but a new way of seeing things." - Henry Miller