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!
Calming jar-tell child that they need a break and may come back when everything has settled to the bottom - I think I love this idea. Better than a simple time out for temper tantrums. some days I think that I need a calming jar.