One camper (stop light) stands at one part of the floor and the others start at the opposite end. The Stop light says Green light, looks away from the campers and the rest of the campers run. When they say red light, the stop light turns around and everyone else freezes. The stop light says who must return to the beginning if they move when they say red light.
Game variations:
Dragons and Unicorns: Glitter and Fire (Glitter= Green, Fire = Red)
Animal: Lions and Llamas (lions = red, llamas = green)
*all others can be called red light vs green light or a themed name you come up with