'Defuse the Bomb' for Superhero party or cannon balls for Pirate theme - fill each balloon with a small trinket (tattoo, sticker, bouncy ball, tiny cars & skateboards, etc) and each kid has to pop the balloon any way they can to get to the prize.
Walk the plank - a great idea for our pirate party! We had a Pirate swimming party and put the across the baby pool. The kids had to walk the plank without falling in the water. It was the best part of the party.