Outdoor Camping

does anyone know of any areas for outdoor camping in or near San Francisco?
My friends and I are college students and want to have a good time out camping. if you have any good recommendation and even experiences to share please do.
Very close to the north, Mount Tamalpias State Park has some nice camping. Just across the Bay, there is Mount Diablo State Park, also not very far. A bit further to the south Butano State Park is beautiful and has a lovely campground.
I have camped at both Mount Tamalpias and Butano and had a wonderful time at each. I never camped at Mount Diablo, but I have seen the campground and it looks nice.
Be sure to get reservations early. Like at least three or four weeks in advance, or you will find your options very limited. You can reserve on-line.
Outdoor / Camping Gear