The singletrack trail branches off of the paved Plaster Creek Trail just a couple hundred yards west of the Ken-O-Sha school. Part of the trail is on the south side, part on the north side of the paved trail.
Currently (2016) there are signs showing where the trailhead is... look for wooden posts with white plastic arrows-a little west of the school. Most of the trail is generally done clockwise, however the longer section right next to the creek (with the wooden bridges) is usually counter-clockwise...there are also some two-way sections. Just watch out for riders and hikers.
This is a great trail that is fun, but not difficult.