As far as places to go, it depends what you are into. If you want good asian food, I highly recommend visiting Chinatown, and getting dim sum.
If you like South-East Asian cuisine, and you happen to go a bit further south to San Jose and were thinking of visiting the Winchester Mansion, right across the street on Winchester boulevard is one of the best Thai restaurants,
called Krungthai. Highly recommend it.
If you are very much into history, I recommend seeing Fort Point (right under the Golden Gate Bridge). There are a ton of museums of course all around San Francisco, catering to one's tastes regarding art, science, history and culture. I would recommend the San Francisco Opera House except the season does not start back up until September.
Across the bay of course is Oakland/Berkeley. Since you are of a presumably far left-leaning bent, there is the University of California Berkeley campus, which might be fun for you. There are also tons of bookstores, shops and fun restaurants in the college town. The university campus itself is quite gorgeous (except for their hideous
brutalist-style law school building, Boalt Hall), and I recommend walking around it to anyone.
All in all, it depends what you are into. If you ever find yourself going down to Los Angeles, I am far more familiar with that neck of the woods. Hope you enjoy yourself.