Basically, there are a couple of fire roads with singletrack in between. So you ride round and back and forth, and enjoy as much singletrack as you can
Start from Steed Park Trailhead: From I-5 in San Clemente take the Ave Pico exit. Turn east and take Ave Pico 1.7 miles. Turn right onto Ave La Plata and travel south for 1.4 miles. Steed Park is on the right-hand side of the road just as you can see the road dead-end. You can also park at the end of the street. The trails start just past the end of the road.
http://www.singletracks.com/item.php?c=1&i=2809