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!
DIY Balloon Surprise- awesome way to answer to dances! Make someone's birthday (or any day) a little better with a DIY balloon surprise on their doorstep! I think this is the best idea for a fun suprise present.