Edit; misread this. Even regular playgrounds are good for workouts though, plenty don't have pullup bars, but monkeybars can perform the same function. I use a playground for my own workouts.

Yeah, that looks to me like an outdoor fitness installation, not a playground. Those aren't too hard to find, though, at least around where I live; most high schools or colleges of any size have one, and I've also seen a few near practice fields or parks popular with runners.

Back in the Seventies there was a fad for public fitness trails with a lot of the same equipment, which might do in a pinch. Those will be a lot more spread out, though, and a lot of them are in pretty bad shape four decades on.

Couldn't say; I haven't been there. (If you see videos more recent than that one, since H4K became sort-of-famous, he actually outfitted his playground with all sorts of interesting stuff that wasn't originally there.)

But a pull up bar (or a swing set) and parallel bars (or any two parallel objects you can hold onto) are enough to do a variety of interesting exercises. (BTW, I assume you know that if you take the Iron Gym you already have and put it on the floor, you can actually use it to do triceps dips as well.)