We did some snorkeling at St. Andrews State Park jetties. My video isn't perfect, it was my first time with a camera underwater. However, it does show what's underneath at the "kiddie pool".
The Jetty Store has masks, fins, and snorkels for rent or sale. I highly recommend doing this, my daughter and her friend consider it the highlight of the vacation.
Click link for 2009 video ---->>
http://www.youtube.com/watch?v=Pktl49m7lOw
Here's the 2010 version ---->>
http://www.youtube.com/watch?v=EwY_QU4vuV0