Located in the Marin Headlands; from San Francisco, cross the Golden Gate Bridge, take the second exit off Highway 101 at Alexander Avenue (after the Vista Point). Do not turn left at the exit ramp and underneath the freeway. Stay right and continue about 500 feet. Turn left at a sign for “Marin Headlands” and drive through the tunnel. Continue straight on Bunker Road for approximately 2 miles. After you see the horse stables on the left, continue around the corner and bear left onto Field Road. Follow the signs up the hill heading to the Point Bonita Lighthouse, Nike Missile Site, AYH Hostel, and the YMCA Point Bonita.