What are some pious military camp grounds or sleepover places within California, close to San Francisco for Teens?

like close to San Francisco, i mean in three hours or less



Answers:   
Mt Diablo state park, one hour from SF.
Here's a pretty correct list:
http://www.trails.com/activity.asp?area=...
in attendance is this awesome place near fresno i feel it's called sunset sand and it is like a 1/2 mile saunter to a beach (not a swimming beach) and it is on the brim of a strawberry field it's really cool, or nearby is dillian beach which is for a while town and on the edge is a huge campground near a beach that have awesome sand dunes and you can swim there but it's cold


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