Frankly, I couldn't point you in the direction of public sliders in Florida; however, the link below provides excellent step by step instructions how to build one. Even if you're not too savvy w/a tool kit, you shouldn't have much of a problem building the slider yourself. I would recomend, though, that you get at least one more person to help you w/the lifting, etc. Charge it!!!
http://www.wakeboarder.com/display.phtml?id=138