Park at Will Rogers State Historic Park parking lot by the Polo Field. Walk up towards Inspiration Point until you come to the trailhead clearly marked as the start of the Backbone Trail. The first (short) part is steep, then you walk along the ridge with beautiful canyon, ocean, and city views. About 1/4 mile after crossing Chicken Ridge bridge, the trail down to Rustic Canyon is on your right. You descend 0.4 miles into the lush and historically interesting Rustic Canyon (trail is steep with ruts. After crossing the creek at the bottom of the canyon you come to a trail junction. Take the trail north to waypoint 34º04.542'N 118º31.004'W. Go right (NE) about 27 paces, then follow the path to your left, and you'll come to a clearing with… (think of the cache name!). The cache is hidden there.
Your return trip is the trail downstream past the abandoned buildings of the old Josepho Ranch and Murphy Complex (there are various little side paths to confuse or interest you). Stay on the main trail; just remember the creek runs on your right. The canyon narrows. When you are close to the dam/waterfall you need to cross the creek, stay on the west side, the path goes down to some steps before the next crossing. There are many more crossings, keep following the path. As of this writing we hardly got our boots wet, but during the rainy season it will be a different story. Just when you had about enough scrambling, the trail takes you back uphill to the parking lot at the East End of the Polo Field.
Word of caution: As always in our local mountains, watch for poison oak, snakes, and check for ticks.
The cache contains: Logbook with pen, geocache site letter and lots of goodies.