I had a spiffy report all written up here, but my system crashed and I lost it.
Lake Linganore in eastern Frederick County has many miles of good trails, from a flat path around parts of the lakes, to incredably steep and technical climbs. This ride was just a small portion of the trails on the NW side of the main lake. It is really worth exploring
Here's the map.

Elevation

Stats:
Linear Distance: 10.11 Miles
Climbing Distance: 5.06 Miles
Descending Distance: 5.06 Miles
Climbing Elevation: 1076 Ft
Descending Elevation: 1072 Ft
Time: about 2 hours