Water-related things are the easiest to do. A fun glass-bottomed boat trip to Shark Ray Alley (guaranteed to put you closer to sharks--nurse sharks--than you would ever have imagined) is fun. You can stay in the boat or go snorkeling. SCUBA diving is readily available as is sport fishing (reef, bonefish -- fly or spinning tackle). The trips to Mayan ruins are very interesting, giving you a chance to see the jungles as well as the small villages and some other resorts. Jewelry, especially silver and jade, is quite reasonable and beautiful. Food is delicious everywhere, and neither spicy nor expensive. Or you can sun bathe and swim in a lovely two-deck pool with a pool bar during the warm season.
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