Here are a couple more Cozumel tips-
Most of the Island is a marine wildlife sanctuary. Do NOT fish from shore even if you see locals fishing someplace. The Mexican Federales will seize you bodily and it will take a substantial bribe to get out of the possible prison sentence. You don't want to be eating chicken necks and fighting for your life in a Mexican jail. Don't even bring a fishing rod, the boat should provide them.
Second, DO Not purchase any black coral or sea turtle shell objects. They are prohibited from possession in the U.S. by the Lacey Act which is federal law. Violation of this law can result in fines in the tens of thousands of dollar.
Third, there is a risk of intestinal dysintary. Do not drink the tap water, beware of ice cubes, and do not eat any uncooked fruit or vegetables. If you want raw fruit, whole unsliced and unpeeled fruit from the market is okay, so long as it is washed in bottled water with a bit of soap before consumptuion. Take a dose of pepto-bismol tablets before every meal it will protect you somewhat but make your crap black.
Instestinal Dysintary- try to get a prescription from your doctor for two tablets of Lotimil. Lotimil is basically The Ultimate Cork and for emergency use only. It will stop the crapping only, it is not a cure for dysintary. You just got to crap that dysintary out if you catch it and let it run it's course. Stop with the pepto-bismol if you catch the dysintary. But the Lotimil will allow you to travel and bug the heck out of town back to the States.
Look for a domestic beer called Supe'rior (it makes Corana or Dos Equis look like worthless junk), and a domestic soda pop called Crystal. Coke brand cola down there is made with cane sugar instead of high fruitcose corn syrup and far better than the cola at home. Order a Ron y Coka sans ice cubs. Limit yourself to two alcoholic drinks a day, there are currently problems in Mexico with counterfeit booze and you don't know for sure what you are getting.
And that's all I know about that.
