Administered by the U.S. Bureau of Land Management, this monument protects Peninsula bighorn sheep and other wildlife on 280,000 acres of desert habitat. Stop by the visitor center for an introduction to the site and information about the natural history of the desert. A landscaped garden displays native plants and frames a sweeping view. The well-informed staffers can recommend hiking trails that show off the beauties of the desert. Free guided hikes are offered on Thursday and Saturday.