Bean Bags!
You can play with any amount of people, single or teams, so everyone can play at once if they want to or just two people can play. You have 5 bean bags that you throw at a board. Each bag is about 4 square inches and filled with either popcorn or pinto beans. You get one point for each bean bag that goes through the hole. You can either play up to a certain amount of points (we play to 21 or to 10 if there are small children) or you can play so everyone shoots 3 rounds, and the team with the most total points wins the game.
It has been a BIG hit for camping, and we make sure we bring it every time or we get yelled at!