Backyard Kerplunk Game: The goal is to get out the sticks without any balls falling out. Children and adults will have a blast challenging each other with this. (via All Outdoor Games to DIY This Summer via Brit + Co.
32 Cheap And Easy Backyard Ideas That Are Borderline Genius
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!