Slaughter Creek WQPL trail probably has the most access restrictions outside of Forest Ridge - there are more signs here than at any trail I've ever been to.
The trail itself is a nice 5 mile single track loop with a cutoff at the 2 or 3 mile point. Bikers go one way, hikers and horses go the other way. Not a lot of views or hills - kind of reminded me of the trails at the Wildflower Center in the same general area.
Be sure to check the Facebook, Myspace, or Twitter pages to see if it is open before making the drive down. There is no water, but there are a few portable toilets. Parking is very limited, and when it is full, that's it - no overflow parking.