Located on Atlantic Avenue near the Amelia Island beach, the state park's entrance road has an adjoining one-way (counterclockwise) mountain bike singletrack which twists and turns around trees and up and down short inclines, traveling through interesting scenery as seen above and below.
Entrance fee is about $5 for a car, but if you park at the nearby oceanfront park and bike into the state park, the fee is a buck or two.