San Diego County, California packs surfside paths, chaparral ridges, and desert-edge views into one hiking region. Walk above the sandstone bluffs at Torrey Pines, trace the shoreline from La Jolla Cove to Harbor Island Park, or head inland for Mission Trails, the San Diego River Gorge Trail, and the climb up San Miguel Mountain. From Del Mar to Julian, the terrain changes fast and keeps every day outside feeling distinct.