There are plenty of locations that actually have reasonable parks and so forth where a lot of people just don't want to walk outside for a decent chunk of the year.
Can you expand on this? Are you describing areas outside that people walk in? Or some other area?
Yes, parks are areas outside. There are other walkable outdoor areas in many places too of course. However, fairly large swaths of the US are very hot or hot/humid in the summer or cold/snowy in the winter. You can still go outside of course but it may not be the best conditions for a pleasant walk.