Recently, the American Podiatric Medical Association published a list of alternative activities for people who felt their walks were just too boring. While I agree that some variation in exercise is a plus for both mind and body, walking never needs to be boring or static.
A walk can be like an oasis in a hectic day or a mini-vacation when the world seems overwhelming. It can provide an exhilarating workout or a simple release of tension and a break from too much sitting. With such ongoing easy access to it and so little cost or hassle, a walk is too good of an exercise option to walk away from.