This is a little off track but if you have not had the opportunity to see the Whale Sharks - DO IT! I am a total dive nut and really did not want to go out and snorkle (scuba snob) with the Whale Sharks. I was one of the greatest experiences of my life. Not to mention the schools of migrating rays that swam just below. There are lots of tours leaving Cancun. They are not cheap but worth every penny.