I'll use my iphone 4s for video and pictures on the cruise, as well as our Canon Rebel for other pictures. I used an older waterproof camera setup a few years ago in Cancun for underwater pictures, but it is already outdated. I have been looking online for a good underwater camera for under $150. Still looking...
*****
We're going light, I guess. I'll have my Canon Rebel, my DD may have her Panasonic point and shoot (which takes better pics than mine) and my phone which I can't figure out why the pics come out so poorly. Video camera.... we're not so good about taking videos but could be fun!