Bogino,
There is a whole area for just snokeling on Castaway Cay. One tip, do your snorkeling first thing. Get off the ship early, find your spot on the beach and head right for the snorkeling. Later in the day the sand is all kicked up and it is harder to see. There were 5 of us snorkeling and we saw lots. Also buy an underwater camera. We really got great shots of everything we saw. The only thing we missed is Mickey, he is very far out and my oldest daughter got kind of spooked at the feel of snorkeling and the distance. So we turned around, but next year, 6/2003 my second daughter and I vow to find that Mickey! Have a great time!