We took the loop trail that crosses in and out of the preserve and Deschutes National Forest. Apparently this rim trail is the only portion of the preserve that you can venture onto without permission.
We parked in the turn-around at the end of Deer Ridge Road; not really marked as a trailhead when you arrive, but you can discern the trail. From here you enter a Deschutes section for a while, and when you enter in and out of the preserve you'll know as the signage is good and info provided.
It was a really fun loop with...on this clear day...crazy mountain views, and on any day, nice views from the rim of the preserve valley and Whychus Creek below. We didn't meet anyone on the loop last Saturday morning. Just incredibly peaceful and beautiful start to finish. read more