While summer in San Francisco means a prolonged visit from Karl the Fog, early spring and early fall can be pretty warm (Hello 75 degree Saturday in March!), so here are some options for making s'mores and telling ghost stories without the car trip to Yosemite:
Beware of the dog-sized raccoons. Okay, maybe they're not that large, but everything sounds bigger in the dark. Arguably the camping locations with the best view in the Bay Area, they'll take some time to get to. Be prepared to hike to get to these scenic spots, the camp sites are a one to two-and-a-half mile jaunt from the ferry dock. You can board the ferry in S.F. or Tiburon (runs seven days a week during the summer months), and there are 10 sites that accommodate up to eight people, in addition to one group camp site that accommodates up to 20; the general sites are $30 a night, and the group site is $50. These camp sites are described as primitive, so if you definitely need a flush toilet, this isn't for you; more information can be found at reserveamerica.com.