Our school normally does the carnival and the PTO helps out. The PTO is responsible for the food. Of course, our booth is very popular. Another teacher had a booth where it cost you one ticket to have someone "arrested" and then that person would have to pay 2 tickets to get out. Very funny - the Principal was arrested a few times. Also, the booth that did the little girl makeovers was very cute and I think they did very well.
We have Tic, Tac, Toe using bean bags; Archery; Bowling; Ring Toss; Bingo, Face & Hair Painting (very popular); Baseball Throw using a radar gun - kids get their throwing speed recorded on a baseball sticker to wear all night(good for bragging rights!); Karaoke Room, Video Game Room or Computer Time (educational games using computers in our Library).
Also, check out schoolcarnivals.com/games.
Lot's of ideas on there for indoor or outdoor. Good Luck!