Free: Contests & Raffles.
About as long as it would take to set up my camp right next to their tent.
I agree in taking it down but be smart. Don't camp there. Let an unsuspecting camper take the space after you cleaned it up. That way when the guy and his buddies that left the tent show up in the middle of the night drunk you don't have do deal with the threats and cursing. You can camp a couple of spaces over and watch the fireworks.