San Clemente State Park is a great place to go camping and enjoy the beach. The campground is located on a bluff that offers great views up and down the coast. It's also a great place to catch the sunset. 

The facilities are very clean but bring quarters for the showers.  It's close to the freeway but I didn't hear anything. There were a few helicopters and Ospreys that flew over from Camp Pendleton Marine Base that made for a good airshow.