With layer upon layer of human habitation atop the highest hill on the Southeastern Atlantic coast, Fort George Island still shows signs of the human touch: the coastal scrub forest is filling in former golf greens.
Resources

Overview
Location: Jacksonville
Lat-Lon: 30.428386,-81.425456
Fees: $5 per vehicle
Open: 8 AM until sunset. Ribault Club Visitor Center is open Wed-Sun 9-5.
Location
Details
Opened in 1928, the Ribault Club attracted affluent guests with a yacht basin, lawn bowling courses, and 9-hole golf course. It has reopened for special event use.
But the island was first settled tens of thousands of years before, and a driving tour around it the canopied Saturiwa Trail (complete with narration on CD from a park ranger) will introduce you to its ancient history. You can also explore the island on its trail system or via a guided 2-hour Segway tour provided by Ecomotion Tours; reservations necessary.