I am visiting SF with my family for the first time from Nebraska. We will be in SF for day and a half (2 dinners and a lunch!!). For lunch, we are planning to go to Chinatown (Lychee Garden for dim sum). The first evening we are planning on visiting the downtown - fisherman's warf, Ghirardelli SQ etc. I would appreciate any recommendations for dinner (upto $20/person). The second dinner also probably will be in the downtown area (although not restricted to downtown as we will be staying in Sunnyvale). We are open to any cuisine, as we don't get to savor different cuisines in Nebraska!