San Bruno Mountain State & County Park

The park has great introductory trails, with a mixture of terrain—fire roads, singletracks, and some steeper ridges. On a clear day, there are pretty spectacular panoramic views. On one side of the mountain, you can see the southern part of the bay, and on the other side, you might be able to see all the way up to San Francisco and the Bay Bridge. Within a matter of minutes, you can go from crystal clear views to being shrouded in fog, so definitely bring a light jacket.