Walking San Francisco By (author): "Rick Newby, Liz Gans"Genres:Nonfiction books Travel books Reference books Outdoors books ISBN1560447060ISBN139781560447061AsinWalking San FranciscoOriginal titleWalking San FranciscoThis guide features 18 great strolls, including 9 in the Golden Gate National Recreation Area, the world's largest urban national park.