At Malibu Creek State Park where we frequent for weekend stays, many families come for the day and find an empty site and set up and then leave when it gets dark. Last weekend we arrived at our camp site and a family was set up with about 20 family members and had their stuff all over our table, fire ring, and were even in our parking spot. They seemed generally annoyed that came to claim what we had paid for. Their kids however insisted on continuing to use our table even as we ate dinner. I invited to eat but they refused. ;)