How to be left alone

First, get you a sandwich board (cardboard will do in a pinch) and, in bold letters, sprawl the ten most offensive racial and homophobic slurs you can think of on it. You may see where I'm going with this, but before you hit the sidewalks, remember this will likely just incite violence against you. So you're also going to want to wear a hat made of pig entrails and wield a large knife in one hand and severed breast in the other. Now you're ready to take to the streets.
I find when I employ this strategy I have ample room to walk and sit wherever I want, and never must I endure the inane babble others seem to thrive on.