Get some planks, nails and a hammer....
Also get some sand in one of those clam shells that you can shut so the neighbourhood cats don't use it as a litterbox.
If you don't have trees in your yard, get the kids to a park where there are trees where they can climb and play Tarzan.
Let them get muddy, jump in puddles, kiss a dog, pick up a sweet and pop it back in their mouths after rubbing it on the seat of their pants to get the dust and dirt off....
Hang a tyre from a rope in a tree or any horizontal beam and let them swing....
If they break an arm from taking a tumble from a too high swing, kiss it better, take them to the Doctor, then write a big DADDY/MOMMY LOVES YOU on the cast...
Scrapes and grazes heal faster when you apply some magic plasters and a get better kiss.
When we were growing up a playstation was the place where your trains came from and went to in the dirt tracks you made.
Television was something the grownups watched news on at 6pm, then we could watch from 6:30 to 7, when the adults would watch Derrick or something similar.
Let the kids be kids, and leave the learning for the 12 years they have to spend in school.