Next on my list of desired seating options were wobble stools, balance cushions, and bouncy bands. Those were the more expensive pieces, just one stool is . -this can help a child stay organized as well as staying focused in their own space
Balloon Rockets - I've done this in several science camps I've conducted. Kids have fun with it. But, when the balloon deflates it may fall off the straw because it's surface area changes - another good thing to show and explain to kids.