Minute to Win It: Puddle Jumper — fill three cups with water and line them up, setting a ping pong ball into the first one. The goal of this game is to blow the ping pong ball from one water-filled cup to the next.
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!