Make a backyard bowling alley. Add food coloring to clear plastic bottles of water. Use party streamers as lane margins. Add glow sticks for night bowling. (These would make great outdoor table nightlights also with the glowsticks, gonna try it!
Paper plates, Popsicle sticks, and a balloon are all you need to play Balloon Ping-Pong. (Not sure how sturdy the paper plates would be, but may be able to do something similar for a carnival/game night social event theme.
Pirate party - digging for treasure cute idea for kids Halloween party.each parent brings a bucket full of sand already filled with the trinkets they want their kid to find - can be a colored bucket the kids can use at the beach the next summer!