Look for a trail off of Skyline Dr marked by a 90 degree turn paralleled by a chain-link fence. This is Rattlesnake, a really fun switchback-filled downhill that has an alternate, steep trail cut right through the center of the switchbacks. Look for a few trail features along the way, but don't forget to downshift at the end for the short climb up to the fire road.
When you reach the road, go right and downhill for a few hundred yards to the Freeway. Or go left up the very steep power line access road that's really no fun at all. Your choice :-)