I've been to grand cayman numerous times if I were you i'd stay on the ship, however, being a tourist you want to go everywhere.
I dont really recommend anything. They tender you on shore so you can just walk around.... And snorkeling is a waste of money, i've done it twice any never any fish or anything...
In Cozumel I rented a car and drove to Cancun and loved it the beaches were beautiful, I heard from a lot of cruisers that took a tour on the ship that they went on a water ancient adventure..
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