St. Sebastian River Preserve Southeast Blue Trail features 10 miles of hiking trails near Sebastian, FL.
From the Sebastian/Fellsmere Exit on I-95, head east on CR 512 for about 1 1/2 miles. The entrance will be on your left. There is a county swimming pool to the left, but you want to keep going down the road till it turns to dirt. After passing through a gate you will come across the first parking area, where you will find a kiosk with plenty of trail maps (hopefully). The trailhead starts here.
http://www.tripleblaze.com/trail.php?c=3&i=541