Come during hurricane season! It's less expensive and no crowds. Even if it rains, a rainy day here is better than a sunny day at work!!!!
When flying to destinations in Mexico go to domestic terminal just after the control tower otherwise you'll have to walk from int'l terminal.
Cozumel has three diferent ferry companys/Transcaribe Car ferry/Mexico Ferry/Ultramar Ferry http://www.cozumelrestaurantguide.com with links to their websites
