Hello!
New here but had to chime in about food as I am a huge foodie. 8^) To me I learn about a destination through its food. It is always a huge part of my travel.
I am near SF (15 minutes away) and for anything authentic Mexican you will not be disappointed with any place in the Mission district, specifically La Taqueria. For Japanese Blowfish is amazing but it is more of a seen/be seen place and quite pricey (but super delicious).
If you found yourself in the East Bay for any reason I would suggest Sushi House in Alameda or Kirala in Berkeley for Japanese and Tacubaya in Berkeley for the best Mexican food.
A link that may be helpful to you is listed below. Yelp is a GREAT resource for anything local...but especially food.
http://www.yelp.com
Enjoy your trip! Cheers! -K