The best place I've ever busked (accompanying a fiddler, not just baaanging my drum at strangers), was by the entrance of a movie theater. It had 6 movies all starting within a window of about 15 or 20 minutes. We started a little bit before the first one and played til just after the last one began. Took a 2 hour break and did the same thing. Made about $40 apiece, and had a lot of fun in the process.

My $0.02

Rich