Take a 2 liter soda bottle, poke holes in it. Attach to a garden hose. Toss over a tree branch and let hang for a kids water sprinkler. You can loop it over a tree branch and let kids bat it around for more watery fun!
Love you, Mum
DIY-Anleitung: Schaukel in Ponyform aus Autoreifen bauen / diy tutorial: horse swing made of tyres via DaWanda.com
20 Ways to Use and Recycle Old Tires - Fine Living Advice