Golden Gate National Recreation Area, which includes Alcatraz Island, the Marin Headlands, Muir Woods and many other Bay Area landmarks, has added one more piece to its portfolio: a large chunk of the Peninsula south of Devils Slide. Negotiations to incorporate Rancho Corral de Tierra into the park took 10 years, and ended plans by a developer to build pricey homes in the Half Moon Bay area. Still, not all of the tensions with local residents have been resolved.