It’s also fairly easy when living in a big city to know your neighborhood well enough that if you don’t want to be alone you can expect to run into one or two of a certain few people at different locations.
Like I know of I got to x,y,z coffee shop I can run into acquaintances of set X, Y, Z. If I want to grab a night cap at bar a,b,c I am run in to set A, B, C. And if I just want to be alone I can just wave and say hi.
Turns out that being alone in nature (as I realized in college) actually doesn't make me feel lonely. This is going to sound kinda weird, but I actually feel a sense of togetherness and belonging being near trees, dense foliage, animals. I wonder why this is? I'm sure there are millions of years of evolutionary evidence to answer my question, but it remains fascinating to me.
Consider this: those who become blind later in life often experience visual hallucinations (Charles Bonnet syndrome). It seems like there is something like a vision module in the brain which, when under-stimulated, starts producing its own content.
Maybe we have a social module as well, which, when under-stimulated by social interaction, starts hallucinating that non-human objects and organisms have human sentiments, and we feel a sense of affiliation as we might toward a human. The happy difference is that there is never a risk of negative social feedback from trees, rocks, or chipmunks, in the same way that there is a low risk of negative social feedback from very young children or kindly old ladies, toward whom I at least also tend to feel a reflexive sense of affiliation.
Thus, the feeling of togetherness we experience in nature is a result of our hallucinating social agents that never give us negative social feedback.
Moreover, exercise and the outdoors make you feel energetic and refreshed for other reasons, and when you feel good, the threshold stimulus for affiliative feeling is certainly lower.
Big Cities also amplify loneliness and make it more crushing when you just keep getting lost in the crowd.
Concrete jungles with more traffic than trees are also a depressing drain upon the soul.
My ideal sweet spot is Small Towns near a Big City that you can dip into once every weekend or so.