Another Pinner said: "This kept my 2 year busy for an entire hour and my 4 year old busy for 2 hours! YAY! Drop vinegar tinted with food coloring onto a pan filled with baking soda. Sheer minutes of colorful fizziness!!... Pretty sure we will be doing this soon!
Make a backyard bowling alley. Add a few drops of food coloring to ten clear plastic bottles of water. Stand them up on flat ground, use party streamers as lane margins, and score a strike for saving cash. At night you can put glow sticks in for a fun twist!