Enjoy the trip. I was in Cozumel before the hurricane and in Little Cayman before their hurricane. I guess I should stop visiting places...
Stop in and visit the camera shop in Cozumel for some great tips for shooting with your underwater camera (or if you take your new camera and trash the probe on it on the first underwater adventure you can rent one there - hehe, that would be me). They are right next to one of the hotels where the cruise ships dock, at the south(?) end of town. I wish I was home so I could get you the name.