Spanning 125 acres at 1628 Lomas Santa Fe Dr in Del Mar, CA 92014, San Dieguito County Park is a sprawling recreational destination on the border of Del Mar and Solana Beach with over five miles of hiking trails, five playgrounds, and panoramic views of the North County coastline. The land traces back to an 1840 Mexican land grant to Juan María Osuna and later served as a eucalyptus forest supplying rail ties for a subsidiary of the Santa Fe Railway before San Diego County acquired it in 1954 for a nominal fee of ten dollars. The park is divided into two sections: the upper park, which opened in 1965, and the lower park, which opened in 1977, each offering distinct landscapes and trail systems. Activity Hill is the park's centerpiece, featuring 10 fitness stations, three hillside ladders, lookout platforms, and two suspension bridges, all connected by a roughly one-mile loop trail with 347 feet of elevation gain that AllTrails rates as easy. From the hilltop, visitors can see the coast and miles of North County communities stretching inland. Two TRACK Trails designed for children offer nature-themed scavenger hunts with prizes available online, and the upper course is fully ADA accessible. Below Activity Hill, large open lawns surround two peaceful duck ponds shaded by mature trees, and a butterfly garden adds seasonal color. Amenities include a baseball field, basketball court, volleyball court, barbecue grills, picnic pavilions, a wedding gazebo, and public restrooms. The park is open daily from 9:30 a.m. to 5:30 p.m. with a $5 parking fee for the lot, though free street parking is available just outside the main entrance. Dogs on leash are welcome throughout the grounds. The Miracle League of San Diego, a nonprofit providing baseball opportunities for children and adults with special needs, operates its games at this park. Just a short drive toward the coast, Del Mar Dog Beach offers another outdoor option for families with pets. The Del Mar Fairgrounds are located nearby along Jimmy Durante Boulevard for visitors looking to pair a park day with racing or events. San Dieguito County Park holds a 4.7-star Google rating with more than 900 reviews.