Until this Sunday I hadn't hit the Bay to Breakers since the days when I could trot out of my San Francisco apartment, run the course in under an hour, and consider it a fun way to spend a morning. Those days are long, long gone. Now it takes me just under an hour to find my running shoes. And by the time I've located them, my knees are already warning me what will happen if I try to run seven miles. . . . There are changes, however. For one thing, the number of rolling bars, boats, and beer...