York River State Park offers some very exciting traisl. Many switchbacks and fast downhills. Hard to climb hills. Narrow at times. The trails can get pretty technical. Rides for all levels can be found here.
How to get there:
Exit 231 off of I-64. Follow the signs to York River State Park. Once you get to the park follow the dirt/gravel road into the woods. About a mile back the advanced trail is on the right side.