Take the famous Dipsea Steps starting behind the library in downtown Mill Valley. Up and over the ridge, down to Muir Woods. Then progress up and over the next long ridge before heading down to Stinson Beach. Wonderful seven miles one-way. Take the local beach bus back about 20 min to the unmarked "Bayview" stop (tell the driver). It's basically on the highway on the first ridge, above the road at the top of the Dipsea Steps. In about 15 minutes, you'll be at your car.
