Lots of foot traffic, gives people the chance to read it on the way home. It's probably near where they can find a McDonalds, but not as confrontational as doing right outside a McDonalds.
Good on you for doing it though! (If you can, find a copy of Change of Heart it's a great advocate book in my opinion. Or, But You Kill Ants, that one helps me with all the questions people like to ask. Best to go into these things prepared ).