Amen Roger. Thinking outside the box is the way to go. You really never know til you try, and you'd be surprised at how many people will hear you, wherever you are, and take note.
One thing to keep in mind is, "get permission."
I was shocked to learn that in Denver, Colorado, you need a street performer's license. Just to set up on a curb somewhere. And (correct me if I'm wrong) but I think you can get fined if you don't have that license. That really surprised me.
Is it like that anywhere else? You need a busking license or something?