www.planetwalker.org/

After a class discussion that included my interest in walking, a student told me about John Francis, a man who ended up spending at least 17 years walking in silence.  I can see the walking part, but I don't think I could ever stay quiet that long.  The link above is to info about him.  There's a book and interviews etc..the silence part ended some time ago. But even so, what a thing to do.  Walking is conducive to listening, lately I've stopped plugging into music, and just trying to hear what's going on, which on walk to work each day is a combo of car engines and bird songs. The other thing Mr. Francis took with him was a banjo. This is not the type of endeavor you undertake lightly, you've really got to mean it.