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You are looking for a camo'd jar a short distance from the trail. At this point, the trail forks. Up the hill is a steeper climb. To the left is more gentle. When you make a loop hike from these trails, you would take one trail out and the other one to get back.
The cache is on a ridgeline trail, not far from the Corral Canyon Loop Trail in Corral Canyon Park. It's pretty noisy at the trailhead because of traffic on the PCH, but you only need to go a couple of hundred yards to get away from the noise. It's a very pleasant 2.5 mile loop hike.
You can read about the trailhead and get a map of trail at Sara Wan trailhead. There is a $5 fee for parking at the lot at the Sara Wan trailhead, along with water, picnic areas and restrooms. There is also free parking on PCH north (west) of the entrance (past the restaurant).
Bring your camera - there are some great views of Malibu and the ocean from the trails.