1. Have you Googled "Intentional Communities"? I believe there's a list somewhere of them.
2. The "Bootcamp" mentioned above is an Intentional Community that focuses on learning skills. That got me thinking that if you haven't explored this site much, you may have missed the SkIP program.
https://permies.com/c/skip
Some of those skills require land, but some can be done in backyards, public parks, and apartments. It would be a step towards the reality you describe.
3. The travelling alone thing is a challenge. I also recall reading about a "solo women van group" that links their people for travelling. You would be in your own vehicle, but you'd be going like a convoy and have company wherever you stop. Then you have to find your destination and plan a way to get there.
4. I do get the fresh air and low car usage thing. Bike paths have been slowly expanding in my area, and the local town is more walkable than many in North America, but it takes a lot of push from committed groups to make it happen. My homestead is long and narrow, so now that I've drunk my tea, I will be off to walk past a garden area, through a mini- forest, until I am greeted by my geese at the entrance to a 3 acre field. Alas, they don't really want me for anything more than fresh water and some breakfast, but they still greet me noisily.