Juniper Springs
It may be a little too north for ya, but it's closer to the east coast from Melbourne. Juniper Springs is in the Ocala National Forest and has very nice campgrounds. As the name states, there is also a natural spring area. The spring feeds into a river that heads further east to Lake Charles. You can bring your own canoe, or rent one. The river goes on for a few miles and takes around 3-4 hours to make it to the pick up point where you can get a ride back to the campsite.
You coming to the rally next week?
Jen