Since you have a car....

I suggest driving down Lombard St aka "The Crookedest Street."

If you go to Sausalito, instead of driving try the ferry (unless you want to make it a stop on your way to somewhere else)

I'm a big fan of the Palace of The Legion Of Honour. It's a lovely little museum and even if you don't go in, there are fabulous views of the city and the Golden Gate to be seen from there.

Highway 280 is claimed as one of the top 10 most beautiful in the country. If you go south to I92 and head west you can visit Half Moon Bay. A very pretty little town near the ocean. Or you could go down Hwy 1 to get there too.

Just a few thoughts.

DD