31. Colossal Connect 4
Ok, you got me. Technically this isn’t “DIY” (obviously, but I’ll bet you could make one). It just so happens I’m a master Connect 4 player, and I plan on having one of these in my yard this summer because I WILL play it every day. Every day. Pick one up here.
32. Backyard Glow Stick Games
Just because it gets dark doesn’t mean all of the outdoor fun has to end! Glow sticks will keep the party going. Wouldn’t these be awesome for a 4th of July party? You could even fill balloons with glow sticks and make a glowing balloon dart board. Or, outline the ring of your cornhole board with a glow stick so you can continue playing all night!