Cherokee Sink.
It wasnt as pretty as other springs but it was nice to swim in. Just a straight column of water straight down 80 feet with almost no shallows. Pretty fun. Little in the way of facilities when I went to FSU. It was empty one afternoon and I got a blowjob from my ex at the time on a picnic table. Has a big diving deck. Solid place to swim.
pic related from google.
Location Just south of Tallahassee Florida:
https://maps.google.com/maps?q=Cherokee+sink&rlz=1C1CHFX_enUS458US458&aq=f&um=1&ie=UTF-8&hl=en&sa=N&tab=wl