By Lupita Peimbert. (San Francisco) – You’ve registered to take part in the happiest run in the world, and the most fun of all races in the universe Zappos Bay to Breakers, or B2B. I am Woo Hoo! too, by the way. I’ve run, volunteered, and written about it a few times, and I love … More First time to Bay to Breakers? 5 things to know.