This is either a very long day ride or an overnighter. Camp at Buckhorn.
from L.A. take the 101 North to the 154(San Marcos pass) just past the bridge make a sharp right onto Paradise Rd. continue to Upper Oso(left) Park in the day use area. Start up Pine Mtn. fire road. Turn right at the brown sign( Buckhorn trail) single track down past camp to Middle Camusa Fireroad(right)back to Pine Mtn. Rd.(left)back down to Uppoer Oso.
http://www.singletracks.com/item.php?c=1&i=3494