For many Southern Californians, the Fourth of July is all about sun, sand and family traditions. One of the most popular spots in the state this holiday weekend will be the Bolsa Chica State Park campground. "We do have friends that come here too," camper Stella Centeno said. "There's about five of us RVs." But to celebrate America's anniversary, especially its 250th, campers must go online exactly six months in advance to secure their spot. "You got to be on the computer.