Mid Drive Electric..
in the 8os I barely lived in SFO, you must be pulling down big bucks, to survive there now .. write software code?
Worked in a bike shop .. Cal Trans ran a van & trailer for bike rider commuters in the east bay across the bridge..
get a Road bike a folding bike a hybrid, (fixie?) its up to you ..
you can go around the hills, and get across SF.
Of course after 100+ years, that is also the main traffic streets ..
BTW, Fisherman's Wharf Docked Ferry serves Vallejo, and just 12 miles north,
is the Napa County Wine Country.
..