I bike casually (and flat)...
Here's mine...no, seriously!. Bought it in Encinitas, CA in 2001.
I put whitewalls on it, and a chrome bullet headlamp.
I rode it
all the time when I lived in Carlsbad, a block or so from the beach: to the store, to the pub, to dinner, to the beach, back to the pub, to 7-11, to the pub again, etc. (you can see how I spent my "beach years", can't you?).
It's all residential (and hilly) where I am now (with no real destination to go to except for an exceptionally shitty convenience store about a quarter mile away), and this thing weighs about 6,000 pounds so I'm not riding it as much now, but I need to change that. It's too cool to sit around, not being ridden (currently hanging on the wall in my grandpa's garage).