bobbiwoz, no, we didn't wear wetsuits. We're from Maine, so water temps in the 70's are fine with us! As I said before, I'd guess the water temp to be upper 70's this last trip. This is the third time we've been in January, and we've snorkeled each time. It feels a bit cool when you first get in, but we found it quite comfortable after a few minutes of getting used to it. A really warm sunny day certainly helps. We saw tons of fish, including several small schools of blue tangs - like Dory from Finding Nemo - and that was really cool.