including museums, visitor centers, cultural reserves, and preserves; as well as lighthouses, caverns, ghost towns, water slides, conference centers, and off-highway vehicle parks. These parks protect and preserve an unparalleled collection of culturally and environmentally sensitive structures and habitats, threatened plant and animal species, ancient Native American sites, historic structures and artifacts. The Department employs State Park Peace Officers Law Enforcement to protect and preserve the State Parks and the millions of people who visit them each year. Parks are patrolled by sworn State Park Peace Officers, of which there are two classifications, State Park Ranger and State Park Lifeguards. Categories The sites managed and preserved by the department are categorized into different types. There are 87 State Parks, 63 State Beaches, 51 State Historic Parks, 32 State Recreation Areas, 16 State Natural Reserves, 14 State Park Properties, 8 Vehicular Recreation Areas, 2 State Marine Reserves, 1 State Historical Monument, 1 State Seashore, and 1 Wayside Park. The Public Resources Code provides the classification of units of the state park system. All units that are or will become part of the system, except those units or parts of units designated by the state legislature as wilderness areas or are subject to any other provision of law are classified by the State Park and Recreation Commission into one of these classifications. State parks "consist of relatively spacious areas of outstanding scenic or natural character, oftentimes also containing significant [...] values. State recreation units "consist of areas selected, developed, and operated to provide outdoor recreational opportunities" and are classified as either State Recreation Areas, Underwater Recreation Areas, State Beaches, and Wayside Campgrounds. State Recreation Areas consist of "areas selected and developed to provide multiple recreational opportunities," and are selected for "having terrain capable of withstanding extensive human impact and for their proximity to large population centers, major routes of travel, or proven recreational resources." Underwater Recreation Areas consist of "areas in the nonmarine aquatic environment selected and developed to provide surface and subsurface water-oriented recreational opportunities..." State Beaches consist of "areas with frontage on the ocean or bays designed to provide beach-oriented recreational activities." Wayside Campgrounds consist of "relatively small areas suitable for overnight camping and offering convenient access to major highways." Historical units are "nonmarine areas established primarily to preserve objects of historical, archaeological, and scientific interest, and archaeological sites and places commemorating important persons or historic events." State seashores "consist