Photos: David Berry from Rohnert Park CA, USA · CC BY 2.0 (1, 2, 3, 4, 5)
1 / 8 · David Berry from Rohnert Park CA, USA · CC BY 2.0
Free, year round. Start at Rodeo Beach, about two miles from the top. Cell service drops in parts of the Headlands, so save the route first.