I know I've been swimming at the spring-fed lake at Camp Thunder in GA, but this was totally different. It was also totally opposite from the Tabacon *hot* springs in Costa Rica.
The park consisted mainly of a parking lot and long wooden walkways widing through the woods. One path lead down to a 'dock' where you can jump into the river and swim around or float in a tube. Our trail ended in a walkway int the water closer to the spring itself.
Once in the 72° water (YIKES! That is COLD!), we walked/swam upstream against the strong current to the start of the river. The spring is a 5 x 15 ft crevice at the bottom of a bowl-shaped pool of water. Although it was a bit cloudy due to lots of visitors that day, I could still swim down and see the spring and feel the rush of cold, cold water.
Next time we go (and we will go again!), we'll be sure to bring our snorkel gear and pick a really HOT day to swim. Thanks to Robert & Chale for taking us to this great Florida landmark!