Good lord, so much snark in this thread, so here's some actual suggestions if you want to enjoy yourself (note: I moved out 3.5 years ago). Get coffee at Four Barrel, Ritual, Sightglass, Blue Bottle, Philz Get tacos in the Missions at Taqueria Vallarta, Taqueria Cancun Go to Noisebridge, Sudo Room, Hacker Dojo Hike at Hawk Hill, Skeggs, Muir Woods, Mt. Tam Look up local concerts at funcheapsf.com. There's so many fan…
Piggybacking off of your Monterey suggestion, take the slight detour there to check out Point Lobos, a particularly beautiful state park.
Also, strongly second Nightlife at the Cal Academy of Sciences. I try to design my trips to the bay area such that I'll be there on a the day of the week those are so I can go (Thursday I think?). It's a great museum, very hands on, and those nights have always had a really enjoyable vibe when I've been.
Oh, and taking 1 north of the city along Point Reyes for a ways is also an excellent drive. You can cut back inland through some rolling hills and get a very different vibe than the city and coast going south towards Big Sur