Take the fire road directly above the water tower a few minutes up until you find a nice singletrack trail leading south. From here, enjoy the consistency of this singletrack for a nice ride that leads to the mouth of Telegraph Canyon. It is completely exposed and usually hard packed, but the winter rains can make it wonderfully green.
This is one of the better trails in CHSP, but it needs more riders! The construction on this end of the park has lead to its neglect, and the tumbleweeds have begun to encroach upon the trail. Get out and ride it!