Since it tis the season and all that, how about the Christmas Party Ride on Saturday? 10am at the normal Keg Creek Parking lot. 25 miles, plan on ~3hrs total time.
If you have never done the Christmas Party Ride: It's a combo of Keg Creek and Mistletoe State Park. Decently long fairly technical (for the CSRA) ride. Lots of creek crossings and other technical features spread out over the 25 mile route. About 8ish miles of the route are road linking the two trails together.