I like to walk to be alone with the world, not to be alone. In this way, walking is a lot like writing. Both writing and walking (as I know it) are fueled by a desire to put oneself in relation to others. Not in direct contact — some aloneness wishes to be preserved — but contact through the mediation of language or shared atmosphere of a city street.
From "The Walker and the Walk" in The New York Times (August 19, 2007).