Don't miss the North Loop. Ride up the gravel road across two low-water bridges before diving into the woods on the right. The South Loop leaves out of the parking lot at the trailhead. The Upland Flatwoods Section is across the road from the trailhead.
These trails are very fun and fast. It's only about 1,400 feet of climbing in 13.5 miles. There are two trailheads for further loop options.