Parks and Waterways
Hills area map it
Entrances throughout the Bay Area
(415) 561-2595
http://www.ridgetrail.org
This 400-mile trail—parts of which are still under construction—loops through the nine Bay Area counties, connecting parks and preserved open spaces and offering hiking, riding, and biking. The 31-mile ridgeline segment connecting eight regional parks offers panoramic views of the San Francisco Bay.