I don't mind being outside in public spaces with other people, I do find "people watching" quite fascinating, seeing how others act, interact, move etc - but I live in a mid-size town surrounded by lots of fields and open space. It's not something I'd want to do in a city or large town.
However, take me away from it all and put me in a forest or on top of a mountain and it'd be bliss. As others have said, it's the interaction with nature and the things you can tune into; the sound of animals, water, the smell and feel of the air. You can feel it, see it and hear it all as there is a lot less intrusion from man-made input which is almost always louder, brighter, and smellier (designed to catch our attention).
Interestingly though I'm not a big fan of water. I enjoy streams, babbling brooks and the like but I don't like open water (hate the sea), lakes and fast running/wide/noisy rivers. They scare the hell out of me. I don't even like boats. It's the not knowing what is around and under me and the total lack of control of myself in that environment - I'm not a fish, I don't have flippers and I can't breathe in water so I don't really want to be there! Happy to float about in a swimming pool though
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AQ50: 41/50
EQ: 4/80
RAADS-R: 188
RDOS:
Your neurodiverse (Aspie) score: 151/200
Your neurotypical (non-autistic) score: 59/200
You are very likely neurodiverse (Aspie)