Wakulla Springs, FL
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We stayed at this lodge at the Wakulla Springs State Park:

The Wakulla Springs is one of the largest and deepest freshwater springs in the world. (http://www.floridastateparks.org/wakullasprings/default.cfm). The spring water is so clear and feels great on the skin.

The swimming area has a dive platform - which is only a few feet from the deepest part of the spring (120 feet deep).  There are also two other platforms you can swim out to.

Here are some gators we saw on our boat tour of the Wakulla River:

They filmed the Tarzan movies along the Wakulla River:

 

Click here for a cross-sectional diagram of the springs:
http://research.gg.uwyo.edu/kincaid/Modeling/Wakulla/wakpaleo.JPG