I would like to recommend the Hatfield McCoy trail system in West Virginia to anyone who wants to ride one of the best trail systems in the country. I have now been twice, once in April and once in October. The system consists of three trail heads, roughly 300 miles of trails total. The goal of the system is to expand to 2000 miles of trails.
Trails consist of mostly mountain riding, rocky and hilly. Very good maps are available online, trailheads, or headquarters. The four classifications of trails are easiest, more difficult, most difficult, and single track. These are real trails with little gravel road riding. Most difficult trails are not playing, they are hard!
Both times I have been, we have camped at Chief Logan State Park. This is a nice campground, but you must drive to the trail heads.
Logan, WV is the best central location to the trail system. For more info check out their website.
www.trailsheaven.com