Del Mar City Beach starts at Powerhouse Park or 15th Street and stretches all the way up to the lagoon entrance at the San Dieguito River (where it meets Dog Beach). It’s a hot spot for swimming, sunbathing, and surfing, and is usually crowded on the weekends. There is almost always a lifeguard on duty, and the park above provides restrooms and picnic tables in addition to a large grassy area and a sandbox play area for children.