Saturday's walk was the east-west streets of southern Noe Valley. 10.3 miles of walking, 9.1 unique. Updated map and GPS map.
I have to admire the pre-automobile settlers who built their houses on the hillsides with full awareness that they would have to walk up and down the hill every day. It is quiet in the hills, but the city skyline (and especially the Transamerica Pyramid) is an ever-present part of the view. The urban/rural contrast is especially sharp on 30th Street, where the character totally changes in the course of two or three blocks. There is a fair amount of new infill construction going on, mostly in a glass-and-wood modern style that seems to fit in well.
More of the grid streets go through than most maps would lead you to believe. Only Cesar Chavez and Duncan above Noe are totally impenetrable. I tried to climb the hill on Cesar Chavez and made it most of the way, but right at the top it is too steep. Part of Castro between 27th and Duncan is dirt. The south branch of Cesar Chavez east from Diamond is partially gravel. Google Maps shows a street called Submarine Bells Way running south from 27th east of Castro, but it is not in city GIS and I did not see it.