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. I might actually make this! You can loop it over a tree branch and let kids bat it around for more watery fun!
A list of daily morning activities/tasks for the kids during summer break to keep their bodies and brains active and their house clean. kids get paid for doing the things on the list; at the end they get to go somewhere fun with the money!