At the suggestion of this board, we booked Capt. Marvin's on our own. I HIGHLY recommend it! It is a small group of about 20. I had e-mailed them back in April, since I had a leary 7 year old. They reassured me that she could stand in the water, and if she did not want to get off the boat, a guide would bring a stringray over to her. Well, she did get in the water, but guides did take the rays over to the boat for those timid people. It was one of the BEST things we did in Grand Caymen.
We shopped a little after that. The Tortuga Rum cakes are wonderful. I suggest you sample a piece.