I've never been on anything that was actually called a photowalk, but I've done lots of walking with camera in hand snapping pictures of just about anything along the was.  Does that count as a photowalk?  I like the guy in the orange shirt (red car picture) doing the James Dean think with the cigarette in his mouth.  Also, did you know that VooDoo Donuts were on The Travel Channel's Man v. Food?