I rode the bike to work this morning taking a different route. Up Portrero Hill to China Basin, over the Lefty O'Doul bridge and along the Embarcadero to Market St. This had the advantage of giving me a few more miles and taking me away from some of the crazier downtown traffic. I had to go up a fairly steep hill (for me at this point anyway.
On the way home, in the dark, I managed to make the turn off of Market on to Valencia which has been eluding me. Strangely enough I did this while my brain was barely functioning due to low blood sugar. Maybe that actually helped.