If the children live in a city, one can take them to a park and spend time there, watching the trees, touching the trees; listening to flowing stream. During weekends, go outside of the city. Watch the stars.
It is a beautiful question and requires us to not be trapped by technology, letting the children e.g. watch TV because that is the easiest thing to “distract” them. To be mindful of what benefits them, and us!
love and respect,