in 89.65% ‘going for a walk’ is not possible unless you want to walk in circles around your house 76km away from the first tree/park/coffee house… you may though go for a drive in a pickup :)
However, this kind of whataboutism illustrates my point. There's a near infinite number of places humans can congregate to enjoy each other's company. It can be a park or a coffee shop or a pub or your kitchen table for tea.
The fact that none of these are suitable demonstrates that the desire to get together is not there.
downtown Denver can house minuscule part of the population of the Denver metro area - only those affluent enough to afford it. America (again) is not downtown Denver or downtown SF or downtown anything...