San Francisco's poshest park, Huntington's 1.3 acres mark the crest of Nob Hill. At the center rises the 'Fountain of the Tortoises,' a century-old recreation of a 400-year-old limestone fountain in Rome. If you're staying down the hill and don't have a lot of time to explore, the park makes a perfect picnic destination – especially with kids, who love the big playground.