Visit the largest and also the oldest Chinatown in the US (dating back to 1848). It is a friendly neighborhood where you can experience the true Chinese American culture.
There are not only many gift shops but also plenty of little restaurants where you can taste traditional Chinese cuisine. It is also a good place to shop for cheap groceries.
Before your visit to Chinatown, be sure to check the official website as there are many events organised in the district throughout the year. You can make your visit all the more special by watching, for example, the Lion Dance performance.