[AlbertCory]

Look up the word flâneur (or flaneur if the accent is a problem).

Nessim Nicholas Taleb describes himself as one.

[bmj]

I highly recommend Rebecca Solnit's book Wanderlust. She dives into the history of walking, and she spends a chapter on notable flaneurs.

[nsxwolf]

We have a guy in Chicago named Joseph Kromelis. He's been walking the city day in and day out since the early 1970s at least. All day, every day. Not homeless or mentally ill or anything, just likes to walk.