As there’s no responses, I’ll offer that my friends’ kids in dense parts of NYC, LA, SF, DC, etc. do all those activities. (Maybe the ones in LA don’t go sit by the LA “river.”) There’s usually loads of neighborhood parks and less formal places in cities where kids play (like playing soccer in an alley). And I know my friends in urban centers have their kids in just as many organized sports leagues as my friends who live in the suburbs. (It might actually be easier on the parents in the cities because my suburban friends are like youth sports taxi services every weekend whereas the ones in NYC have enough population density where the league is in the neighborhood.)
So, my impression (from the parents’ childless friend’s side) is that kids, like Jurassic Park’s dinosaurs, find a way. They’ll play hide and seek in a desert and try to hide behind tumbleweeds.
Again, sorry if I’m talking out of turn but this is Lemmy and there were no responses yet so I thought I’d toss in what I’ve seen as an adult. Gotta feed the content maw until the Fediverse grows up to be an uncontrollable beast.