Swiss Avenue is poised at the center of a whole bunch of socio-economic bubbling and brewing, rich and poor living pretty much cheek-by-jowl, separated only by the alleys and the cars they drive. The magic of Swiss in the evening is that nobody drives a car: Everybody walks, or, more properly, promenades. Especially on summer evenings when the temperature drops--as if it ever drops--people pour out of all manner of dwellings, low and tall, to push their babies, pull their dogs, walk with lovers or stroll alone with their thoughts, up and down this gracious old divided boulevard. It's worth driving to; lots of people do. If more aerobic pursuits are on your mind, this section of Swiss is almost exactly one mile long, making it the ideal length for an up-and-back morning run, when the sprinklers are sweeping across the majestic lawns and the gardening crews are getting to work. Using the sidewalk, you see, is the only thing non-residents can really do here. And what a sidewalk it is. Wide enough for people and dogs to coexist. Flat enough, because in this precinct, people even repave their sidewalks when they begin to buckle. In other words, they foot the bill, you provide the feet.