If you're into snorkeling, take the cruise excursion to the Lagoon and Sea Turtle Sanctuary. We did this last year - it's a longer snorkling trip than normal and it costs more, but BOY was it worth it!! Carlos and the other 2 guides actually went in the water with us at both places. They had waterproof underwater books with fish pictures so they could point out to us what we were seeing. We stayed at the lagoon for about 45 minutes, then got on the bus and headed to Akumal where the sea turtle bay is. There we snorkled for about another hour (or you could just hang out on the beach). After that, we stayed for about another hour at the little beachside cantina and had lunch and drinks and then it was back to the ship. BTW, they provided bottled water, so don't waste your $$ on the bottles they try to sell you as you get off the ship.
Nancy G.
Fantasy to Bahamas - 10/04
Fascination to Key West, Playa Del Carmen (Hurricane Wilma took out Cozumel!! ) - 11/05
Inspiration to Cayman and Calica, MX - 11/06
Victory to Puerto Rico and the Virgin Islands - 11/07
Sensation to Bahamas (with my dd for her b-day!) - 1/08
Inspiration to Cozumel and Grand Cayman - 12/08