Me, my wife, and 3 boys were on vacation in GC. We were staying at the Christopher Columbus Condos and there was a sign for free scuba instruction in the pool. We showed up and Casey gave us a great lesson (2 of the 5 had scuba'd before) so we went out with her.
We did two boat dives and stayed down quite a long time. We went to Lemon Reef and one other place. We saw an enormous loggerhead turtleamong lots of other cool stuff.
Search FiveYorks and Grand Cayman on YouTube to see one of the dives.