Source: http://www.goaround.org/travel-america/241483.htm
Plan ahead. How long do you plan to be out camping? When do you want to camp?
Consider what type of campground you are interested in. Are you looking for an individual or group site? Are you interested in one of the sites operated by the California State Parks Service?
If you want a group campsite, you have a variety of options. you can call to make a reservation for the circle X Ranch campground at (805) 370-2300. or, plan an impromptu trip to a walk-in site at Leo Carillo State Park, point Mugo State Park, Malibu Creek State Park or Topanga State Park.
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A variety of sites can be reserved, and there are plenty of first-come, first-served sites as well. Call the California state parks at (818) 880-0350 for information.
Pack for your trip. Only bring as much gear, food, water and clothing as you will need.
Head to the area and follow directions for the campsite you will be staying at to claim your reserved campsite, or reserve a first-come, first-served site.