A good design problem for a class, indeed. Reminds me of what our friend, William H. Whyte once said:
“All things being equal, you can calculate that where pedestrian flows bisect a sittable place, that is where people will most likely sit. And it is not so perverse of them. It is by choice that they do so. If there is some congestion, it is an amiable one, and a testimonial to the place. Circulation and sitting, in sum, are not antithetical but complementary.” [via pps.org]