Keep a close watch for a small sign that says “Rockefeller Forest / Lower Bull Creek Flats” next to a single-lane paved road that descends the embankment to your left. Because the road descends so steeply into the dark forest it can be hard to see. Park on the loop at the end of the short road.
Altogether there are over 100 miles of trail in Humboldt Redwoods State Park.