There are lots of singletrack loops off of the main trail that you can take. If you follow the trail you will come to a suspension bridge that is very cool. Unfortunately there are no bike trails on the north side of the bridge but there are some hiking trails. Same as above, just get to the trailhead and pick one, look at the map first. LOTS of sugar sand, theres more sand here than at a beach.
Some areas are incredibly rooty.
There are also some sections that are fairly clear and a lot of fun to speed through. Don't klnow, my dad just drives me. They just opened up a new loop that goes right alongside the bank of the Econlockhatchee River, great to kayak too, and it is a blast. Go along the trail and take a swim at the foot bridg if you want. Guys please do not step foot on the footbridge across the river if you are not a member of the appropriate orginization, and there is one.