I feel like parks in most of the U.S. are dominated by activities. Sports, jungle gyms, etc. Often times there’s not a great place to just sit down and socialize.

every single park ive ever been to does in fact have this weird little thing called grass

But there's also the sprinklers that go off every minute to keep the grass looking healthy so no one can sit on it. Or the grass is part of the baseball field. Plenty of good parks in the US for hanging out but wayyy more bad ones where just socializing seems like an afterthought, or not a thought at all.

Nah there's still plenty of "An area that's mostly nature and you can just walk through and enjoy it" but the vast majority of them were set up a hundred years ago so the reality is that most of them aren't even remotely close to population centers anymore. This means if you want to walk in a park, first you must drive there. Also in many places, staying past sundown is not allowed, as in the cops drive in (like they will actually drive around on the grass if they physically can!!) and sass you.

Yeah obviously the US is huge and there’s plenty of nature to be found, but somehow we’ve just forgotten to integrate that into our communities and walkable areas completely.

Now I'm wondering if you think we have tiny parks or gigantic playgrounds

The parks as I know them are.

In Germany, there is a park within walking distance, and usually a bike paths leading to it. You can also walk along numerous paths in the forest and along rivers.

In Canada, I would have to drive to them, or risk biking on busy roads. It boggles my mind that you have to drive to the place where you walk. These parks also tend to severely restrict what you can do, and when you can do it.

Sure, there is amazing nature if you can drive to it, but daily access to green spaces is sorely missing.