How to keep a child busy for hours in the summer: DIY: Giant Ice Cube Awesomeness - filled with plastic animals, dinos, and such. And I'm sure you could put in food dye before its frozen to color it like the ice block in the photo.
A TIN FOIL RIVER * A River Runs through it. (in our front yard) * Camo and Bows * A trickle from the garden hose keeps the tin foil in place "as you build it" along the route the water flows! * Kids of all ages will enjoy on a hot day.