San Dieguito River Park is a regional greenway and hiking destination along the Coast to Crest Trail in Del Mar, CA 92014, established in 1989 to preserve and celebrate the 55-mile San Dieguito River corridor stretching from the Pacific Ocean at Del Mar to Volcan Mountain near Julian at 5,850 feet elevation. The backbone of the park is the Coast to Crest Trail, a planned 71-mile multi-use route open to hikers, bikers, and equestrians, with 49 miles currently completed and over 20 additional miles of auxiliary trails. The western trailhead near Del Mar follows the San Dieguito Lagoon, a critical inter-tidal wetland habitat that supports an extraordinary diversity of shorebirds, herons, egrets, and migratory species documented through regular bird surveys. This easy, flat section of trail runs roughly two miles each way along the lagoon and is one of the most accessible birding walks in San Diego County. Dogs are allowed on leash, and the trails are open daily from 6 AM to 6 PM. The park carries a 4.8-star Google rating across 76 reviews and is family-friendly with kid-appropriate hikes. Visitors exploring Del Mar's trail network often book a room at Les Artistes Inn, an art-themed boutique hotel in the heart of the village. Parking for the lagoon trailhead is located off Jimmy Durante Blvd just past the bridge over the San Dieguito River, with pre-pay machines operating from 8 AM to 8 PM. The San Dieguito River Valley Conservancy manages ongoing trail-building efforts to close the remaining gaps in the Coast to Crest route, including a critical segment through Pamo Valley. Free street parking is available near several trailhead access points. A post-hike pick-me-up awaits at Pacifica Breeze Cafe, a neighborhood coffee spot convenient to the Del Mar end of the trail.