The 4 star ride is a bit more involved, but trust me, you will love it. Start at the bottom of Sullivan, go all the way to the top, and head up Sullivan fire road(right). From here, you head up to dirt Mulholland, and go west (left). Head over the hump to the trailhead for "cliffside", a sweet little singletrack that earned it's name. This will drop you off right across the fire road from Caballero Canyon. You will see a metal gate before it drops too far down on the Valley side. Hit this descent with all the spin in your legs, and tear down that trail througgh the rocks, streams, and snakes until you reach Reseda Blvd. Then, turn around and do it all in reverse. It only takes about an hour and a half, but if you stop a lot, give a couple of hours. You won't regret it!! The ride is equally groovy from either side, as they both end with a long and fast descent.