We're doing the snorkeling on the catamaran in Key West and also in Cozumel(Fury booked thru Disney). We've been on the Fury in Key West before and really enjoyed it. We've booked directly thru Captain Marvin's for the snorkeing in Grand Cayman, and then the boys are going on the banana boats at Castaway. Captain Marvin's also takes you to another spot in deeper water for snorkeling besides with the sting rays.