Start the ride at the south end of the Henry Lake Trail South. At the junction follow the signs for the RCW trail. Ahead of you is about 2 more miles of the same singletrack through the trees you have been riding to get here. You'll cross a fire road twice. Once at 1.0 miles and the second time at 1.7 miles. Just stay cross the road to the obvious singletrack on the other side. At 2 miles you'll hit the end of the RCW Trail at another junction. Turn left on the C Trail to head back towards Double Lake.
Like the other trails in this area, this trail is easy to follow and made up of nice flowy singletrack. There are a few junctions along the way, but they are well signed and easy to follow.