The hillsides of the 50-acre green space overlooking Old Town from the north end of Taylor Street are popular with picnickers, and many couples have taken their wedding vows on the park's long stretches of lawn, some of the greenest in San Diego. The park offers a great ocean view from the top, and more than 2 miles of hiking trails below. It's a nice walk from Old Town to the summit if you're in good shape and wearing the right shoes—it should take about half an hour.
You can also drive to the top of the park via Presidio Drive, off Taylor Street.
If you walk, look in at the Presidio Hills Golf Course on Mason Street. It has an unusual clubhouse that incorporates the ruins of Casa de Carrillo, the town's oldest adobe, constructed in 1820. At the end of Mason Street, veer left on Jackson Street to reach the presidio ruins, where adobe walls and a bastion have been built above the foundations of the original fortress and chapel. Also on-site is the 28-foot-high Serra Cross, built in 1913 out of brick tiles found in the ruins. Continuing up the hill, you will find the Junípero Serra Musuem, built at the sight of the original Mission San Diego de Alcalá and often mistaken for the Mission. Take Presidio Drive southeast and you'll come to the site of Fort Stockton, built to protect Old Town and abandoned by the United States in 1848. Plaques and statues also commemorate the Mormon Battalion, which enlisted here to fight in the battle against Mexico.
Taylor and Jackson Sts., San Diego, California, 92110, USA