There is a small amount of poison oak in the general area; it is easily avoidable if you are in the correct place. Also, remember to check for ticks as there are a lot of deer in this park.
Preserve is open dawn until a half hour after sunset, please only cache during park hours. Park information can be found at:
Park information, trail maps, and directions
I parked near the intersection of Willowbrook Drive and Alpine Road and walked along Alpine Road until I reached GC1CQXP "Trolling For Razorback Ridge Trail". This cache is located very close to the beginning of the Hamms Gulch Trail.