Huntington Park is a beautifully quaint plot of land that both a tourist and a local can appreciate. In the spring and summer, it's full of blossoming flowers. But there's scenery to enjoy year-round at Huntington as it's surrounded by unique architecture, including the Gothic style Grace Cathedral and historic hotels all within plain view. Dogs are allowed, in fact, welcomed, at this park. There's grassy areas as well as small concrete plazas that are lined with benches to sit and watch pups play, pigeons coo, or lovers woo. Woh Hei Yuen is shared between Nob Hill and Chinatown, residing just on each edge. The park is frequented by locals, from young to old. Woh Hei Yuen, or Garden of Peace and Joy, has a playground equipment, well-kept landscaping, and multiple seating options. Shade and concrete keep the park cool and semi-quiet, somehow blocking out the noise of Chinatown, which is the most densely-populated neighborhood of SF. A small raised platform, shielded from the sun by its gazebo-like roof, highlights traditional Buddhist temple architecture, reminding one of an ancient, sacred Pagoda. Dogs are allowed, but you may want to visit after you tire them out, as some use this area for meditation.
Any metropolitan area will do what it can to create and maintain parks, even if there's little space to work with. Large cities like Seattle and Chicago sometimes call these tiny parks, pocket parks, or corner parks. In San Francisco, however, they are more commonly referred to as mini-parks and there are a number of them in the Nob Hill area, including the Broadway Tunnel West & Broadway Tunnel East Mini-Parks.
These mini-parks, on either end of a heavily trafficked four-lane street tunnel, are both relatively small and feature a few benches and trees. Both parks are accessible via this tunnel, but if you can avoid it, you should, especially with a dog. Cars travel fast and the noise of traffic is emphasized by the insane acoustics of the concrete tunnel. What's more, the pedestrian walkways through the tunnel are narrow and the only thing separating you from the busy street is an open-concept metal fence. Even if your pet is trained off-leash, for their safety, you should always have them leashed outside of a park, especially in the Broadway Tunnel.