Manatee Springs is the spring that we like to use for Open Water dives.  It is a very popular state park because of how clear the water is.  This is an awesome spring to complete your scuba certification at.  There are two dive sites at Manatee Springs, the main spring and Catfish Hotel.  Catfish is covered in duckweed, there is almost always a second dive after Catfish in the main spring to wash off the duckweed.

http://floridastateparks.org/manateesprings/default.cfm

Map to the park 

http://goo.gl/maps/rbLei

Surface Interval at Catfish Hotel