Possible route:
SF AppleStore -> Ferry Building (Bay Bridge) -> Fog City Diner -> Coit Tower -> Pier 45.
Goal is to get to Coit Tower at around 8PM for sunset at ~8:15PM - there are some nice views of bay bridge and city on the way up.
Total distance is about 3 miles but walk up Coit Tower is a bit "invigorating". Am open to other plans - if we decide to be wimps - just a walk to the Bay Bridge is decent.