The spectacular 600-foot Feather Falls is in a beautiful valley similar to the more famous one in Yosemite--but without the crowds. The hike is a good nine miles round trip.
On the way, look to the left for Bald Rock Dome. A huge granite rock, it stands over the valley like a silent sentinel. It's similar to El Capitan in Yosemite.
Also, observe the mortars (depressions) in the rocks along the way. Indians created them while grinding acorns on the rocks. They made them into a paste (I always wondered what that tasted like).