Mujitsu and Tairaku's Shakuhachi BBQ

could visit this shop:

http://www.clarionmusic.com/

Maybe stop by John Singer's place for a lesson. He might take some Albanian goat sausage and Raki in exchange for a free lesson.

To eat, Thanh Long for crab and garlic noodles.

If Philip Gelb is a killer vegetarian chef, he will probably recommend the killer vegetarian restaurant Greens. 

I recommend The Exploratorium, which is a fascinating interactive museum.  I also recommend wasting many hours in the Lark in the Morning store on Fisherman's Wharf.  Don't park there if you don't have to--parking is 20 bucks.  You can sit and tinker with a zillion world music instruments.  Another good place to waste time and money is Amoeba Music. 

Take a ride across the Golden Gate Bridge and explore a bit of Marin County, too.   

If you have 10 days, you will have enough time to talk to locals and get their spin on what's happening.  There will be free concerts in parks, poetry readings at City Lights (maybe even by Ferlenghetti), and all kinds of little shops and places to explore.  Oh, I thought of another place.  Go to the Mission District and check out 826 Valencia.  This is a combination piratical supply store (really!) and Dave Eggers-founded childrens writing center (also really). 

http://www.826valencia.org/  It's located at 826 Valencia, duh.

Cool!!!! Thanks for the info.
It will be a plessure to meet!