I just got back from a great "girls mini-vacation" in Key Largo with a friend of mine. It's hot at home, and it's hot in the Keys, but it's a wet-hot there, especially since I got to spend a lot of time under the water! I certified to dive back in the 70's, when I was much younger, and there was only one kind of recreational dive certification available. Now, you can get all kinds of different certifications - but how many of them were included in my original one I don't know