Some of the more interesting spots:
Fleetwood Diner at 300 S. Ashley. It's famous for being always open and for its hippie hash - which is hashbrowns with a twist. (Hash Bash, a marijuana celebration, is an annual Ann Arbor event.) In the middle of the night, Fleetwood attracts some of Ann Arbor's more interesting characters.
The Ann Arbor bus depot, the Greyhound station, is a time warp seemingly unforgotten by the last 50 years.
The Diag in the center of campus attracts preachers, protestors and loafers.