SanFran is *OK but Frisco is very no-no! Well, we just call it "the city" and really nothing else anyway.
😉
For non-touristy shopping, Valencia Street (parallel to Mission Street) and Hayes Valley could be good.
For touristy but nice photo opportunity, this particular vista point is great for Golden Gate Bridge. You cross the bridge from SF, then come around going under the overpass. Right before you get back on to the bridge, you can exit to right. If you go up the hill a bit, you'll get a small parking area, from there you can walk right up to the edge of the cliff where you can see the bridge from above. Very nice at sunset or after that, and not too many tourists. (can send you detailed direction if interested)
Muir Woods or Mt Tam could be a quick and easy hiking near the city. There are tour buses going to Yosemite as well, but I'd recommend at least a couple nights of stay to see the place so that could be a bit too much for this trip.
Unfortunately most of national park camping sites are all booked for the season. You might have a chance with state parks and private camp sites.
Food recommendation could be too hard without preferences, but try going outside of downtown touristy area. If you have any specific preferences, I'm sure we can give you recommendations. Food trucks (called Off the Grid,
http://offthegridsf.com) could be fun for lunch.
For night entertainment Yoshi's could be fun. It's jazz a club/restaurant and often gets pretty good lineup through out the week.
http://www.yoshis.com/sanfrancisco
If you are into coffee, Blue Bottle and Four Barrel are my favorites tho there are many other local shops and roasters.