Here's an idea for those of you who have a garden or a yard where your sons, daughters, nephews and grandchildren like to come and play.
You can make them their own playground in your back yard, centering on a sandbox made out of a big tire filled with sand. Ask round, if you (by some chance?!) don’t have a tractor or a truck of your own.
Instructions are available here, and this is the result. Post your results in the comment section!
Extra tip: you might also want to add a sunshade, especially in the summer. An old umbrella would be just right!