The best way to start a day in San Francisco is to hike up one of its hills to get a bird’s view of the city. I decided on Twin Peaks and looking up from the Vista point I was welcomed with that classic San Francisco view: fog rolling in from the ocean, routed by a fierce wind, beheading all things small and tall in its course. I love fog and the way it plays you, giving you the world one moment only to take it away the next, closing in on you and narrowing your view to what it wants you to see, like this lonely cyclist. What does a cyclist do up on a windy and foggy hill? Why did he bring…