Marin Headlands Excursion Professional Review and Guide
"The Marin Headlands Excursion covers portions of an extremely popular road cycling route in southern Marin County. So popular, in fact, that multiple Tour de France (and Giro d’Italia) winner Alberto Contador was spotted along this route in late 2010. The real draw may be the Golden Gate Bridge—riding across is an attraction.
While nearly everyone parked here will be hiking, running, mountain biking, or even horseback riding onto the GGNRA trails, you will be the oddball by heading in the opposite direction, on Tennessee Valley Road. At the end of the road, after a few undulations and exciting curves, turn right onto SR 1."