The holes in your logic are the individualism and scale. Very few people will ever be able to live in a detached house like yours, by definition. Either the forest will eventually be cut (rendering the nature dead), or the supply will forever be small and expensive (not accessible to millions of masses). The only way millions of people could have access to a large natural area to hike is indeed apartment blocks urban islands surrounded by large spaces of nature, like the 2nd image. They don't have to have tens of floors, just 5 floors of large apartments can house many people with comfort while also having amenities (that can be paid sustainably too) to boost.