I do not snorkel, but would love to go under water to see the exotic fish. I read about sting rays and Dunns Fall, have not heard how the tank that takes you under water to see the fish for those people who do not snorkel? Traveling to Grand Cayman and Ocho Rio in August?

have done the snorkel thing 3-4 times, the fish and other marine life are nice. not sure what all ports you are seeing but having been to jamaica 2 times, cayman three times, and cozumel 4 times. I would reccommend this- dunns river falls in Jamaica(assuming you are docking at Ocho Rio and not Montego Bay. It is a 7 hour tour from Montego Bay most of which you will be on a bus.) The stingray tour is a MUST in the Caymans, and if you don't snorkel cozumel has a tour called Sub-Ocean view. It is a boat with the passenger compartment under water with windows. Seating similar to a school bus and everyone has thier own window. Not Quite the same as snorkeling or scuba.

I can vouch for the stingray's being fun. We just did that tour 1/26. I don't swim really well, but the water is only waist deep on the sand bar. The water was a little rough the day we were there, and it was very interesting trying to stay upright! But we laughed and had a really good time. Also, on the tour we booked, there was a person that did a video of the trip and while we don't snorkle, we purchased the video and were able to see the fish that were down below us that we could "kinda" see thru the water while on the boat.