cozumel is an awsome place, i was there 5 years ago. Not to much wild life on the cost the faces the mainland but the side that faces the pacific had more vegitation. Make sure you go scuba diving because they have awsome reefs (and there is this experienced dive, its on a wall, and well its amazin). well have fun and drink lots and make sure you know who you will be waking up beside.
IF IT CAN'T KILL YOU, WHY BE AFRAID?