Mount Davidson: Several trails criss-cross the hill, which offers sweeping views of Twin Peaks and the city. And of course you have to check out the iconic cross at the highest spot in San Francisco. Photo: Pete Kiehart, The Chronicle / ONLINE_YES
Heron's Head Park: The trail is short but the scenery is amazing, with views of the bay and more than 100 species of birds. The park is also home to the EcoCenter, a green building highlighting ecological processes and native plants.
Stow Lake and Strawberry Hill: After paddling or walking around the lake, head over one of the bridges to enjoy the trails of Strawberry Hill. There's lots to discover, including a waterfall and a peace pagoda, and nice views from the summit.