We rode Chubb, Lost Valley and Castlewood last month (Greensfelder was too wet to ride thanks to recent rains). Chubb was delicious rockiness. Very fun! Go to the RR tracks entrance. Castlewood reminded me a bit of Sunder. Also very fun. Lost Valley was flowy, fast with rocks interspersed. We had some challenge finding the entrance to the singletrack at Lost Valley. It was probably 4 miles along a gravel road from where we parked. We likely parked in the wrong place. Have a great time down there!