San Mateo Campground at San Onofre State Beach offers a remarkable coastal camping experience in San Clemente, California, nestled along the scenic Southern California coastline. Situated approximately 1.5 miles inland from the Pacific Ocean, this California State Parks gem provides easy access to 3.5 miles of pristine sandy beaches and world-class surf breaks, including the legendary Trestles Beach — a premier destination for surfers of all skill levels. A dedicated 1.5-mile nature trail connects campers directly to the shore, winding through ecologically rich riparian and wetland habitats along San Mateo Creek, home to rare and endangered wildlife species. The campground is well-equipped with RV hookups featuring water connections, a dump station, hot showers, flush toilets, fire pits, picnic tables, and grills at each site — making it ideal for both tent campers and RV travelers. Pets are welcome, and firewood is available on-site. Outdoor enthusiasts will enjoy hiking and fishing opportunities throughout the surrounding natural landscape. Conveniently bookable through ReserveCalifornia, San Mateo Campground is a top choice for those seeking a blend of coastal adventure and comfortable amenities in Orange County's celebrated beach corridor.