Rainbow Bubble Snakes - Need: Half a waterbottle, rubberband, bubbles (dishsoap/water), food coloring, sock. Steps: Dip sock held by a rubber band on the water bottle in food coloring in dish soap and food coloring and blow. Have fun!
Patio Decor and Gardening / urban gardens, small space manipulation. No instructions, but good inspiration for taking a very narrow and challenging space and turning it into a tiered garden with vertical elements.
Paper Airplane Target practice -- yes! Cut holes in a large piece of paper and have children aim their hand-made paper planes through. Set a certain number of tries, and give a prize to the winner who got the most planes through the holes.
Everyone likes to shoot the paper off of the straw, now we can doo it over and over. How to make DIY straw rockets for hours of kids’ fun! Simple and easy to make, with materials you already have on hand!
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.