Leave the kids at the park (link)
This Mom is right: Unplug the kid and get them outside in the sunshine.
This Mom is also wrong: you don't want to throw them to the wolves. Which is exactly what an unregulated herd of neighborhood kids are. Let alone having them roam a subway system to find out the hard way how the world really works.
Far better to be the Dad who took them to the park and pushed them on the swing, showed them the tadpoles in the creek, or helped find the best tree for climbing.