[punkass]

You need to be places where people have coins.

Financial district sucks -- no one has change.
Restaurant/bar sucks because everyone uses credit/debit cards or rounds to nearest bill with tip.
Shopping District sucks because of same credit/debit issue.
Random neighborhood street corner -- someone will probably call the police on you. They'll say they saw you doing drugs or something to get you away.

Busy corner sounds good. With plastic being accepted everywhere, including fast food, no place is good anymore.