Cozumel I was amazed at the water. From the top deck on the back of the ship you can see all the way to the bottom... Could have spent hours just watching the fish, in fact I think I did. Don't like ship excursions, but this is one place I'd stick with their excursions. we like to set up our own tours, and stay away from ship stuff. We're had a lot of luck doing our own thing, but Cozumel? Not comfortable winging it there.
This is the first place I've seen Armored cars with ads about armored limos, body guards and other security.
Felt safe the entire time we were there (we just got off the ship and walked around) but there were armed soldiers and police every block.
I wish we had done a glass bottom boat excursion...