On a network of paths that ring the San Francisco Bay, high on the ridge line, the Bay Area Ridge Trail provides quickly accessible recreational opportunities for Bay Area residents and visitors alike to hike, mountain bike, and ride a horse. When complete, this 550-mile trail will link more than 75 public parks and open spaces. With over a dozen new hikes, the fully updated third edition of the official guide to the trail covers the more than 300 miles that have been opened to date. Each trail-segment description includes information on amenities such as restrooms and water, driving directions, and accessibility logistics for those traveling by foot, mountain bike, horseback, wheelchair, or public transportation. Official guidebook, published in cooperation with the Bay Area Ridge Trail Council, which plans, promotes, and constructs the Bay Area Ridge Trail and offers outings, volunteer opportunities, and membership benefits (www.ridgetrail.org.)