> When you live in a rural area none of these are needed, zoo, aquarium
Perhaps if you live adjacent to a major national park or forest, or marine preserve, but most easily habitable rural areas are not that, and instead are industrially farmed or extracted from - essentially factories. Sure, there are exceptions, but not enough to accommodate the number of people that it would take to make a difference in cost of living in urban areas, not without ruining the access to wildlife viewing that makes those places unique in the first place.
> bike trail, running path
The environment doesn't provide either of these. They are created by many people either re-using the same route routinely, or by some institution building and maintaining them.
