Washington is a city that abounds with parks, open spaces, and bike trails. You don’t even have to go outside the city to find something close to wilderness. Within sight of the Washington Monument is Roosevelt Island in the Potomac, with 88 acres of hiking trails. And from the balcony of my apartment in Alexandria, VA., I can watch ducks and geese on the stream and see people walking along the footpath in a quite extensive park. I feel as if I am in the middle of the countryside, yet I’m a matter of yards off a busy thoroughfare.