These are areas of unparalleled natural beauty to be handed to our children undisturbed. We are merely custodians. You would not build a toll plaza and an administration block in the Grand Canyon or next to the Victoria Falls or within any other World Heritage Site.
Throughout my 20s I spent a lot of time just playing and not really working, but fortunately for me I continued to get just enough work, and have a reason to wake up in the morning. I really empathize with some of my peers who had success in the early years then it dries up, and so there's no reason to get up in the morning.
The most common objection that I hear to walking as exercise is that it's too easy, that only sweaty, strenuous activity offers real benefits. But there is abundant evidence that regular, brisk walking is associated with better health, including lower blood pressure, better moods and improved cholesterol ratios.