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Doing Cozumel on your own is an easy thing. You'll be able to rent a jeep just off the ship. Some great snorkeling spots to try are Dzul Ha and Chankanaab. Both are also great places to stop for a "cold beverage". Nachi Cocom is a great beach to stop at as well. No snorkeling, but a good restaurant, bar and pool with a beautiful beach. Coconut's has a great view and Mezcalito's has fantastic margaritas. Have a great time!