Best excursion in the Western Caribbean in MHO, would be snorkeling with the Sting Rays in Grand Cayman. You can do a shop tour of Sting Ray City, or pre-book with an independent shore excursion company, either way, just get there and enjoy. Also purchase an underwater camera before you leave. Here is a link to Capt. Marvin, he does a good excursion in Grand Cayman, have fun!
Re: Re: Cozumel, Gd Cayman, Ocho Rios (What to Do)
I concur...stingrays, however you get there is fine, just get there.
In Cozumel you can go snorkeling with eagleraydivers.com. Nice 3 reef tour with lunch for $60. Other tours also available. If you want to go on your own snorkeling you can try Chankanaab park or Dzul Ha. You could go to Playa Sol Beach club. $19 includes admission, use of all non-motorized equipment and all you can drink.
In Ocho Rios you should climb the falls. The Cool Runnings tour boat looked like a lot of fun. You can then go to the Island Village and a Jimmy Buffet's Margaritaville there.