Where are you coming from and did you have any particular cuisines in mind?
In addition to the restaurant, Spruce has a cafe that opens at 9:30am everyday and has some of the best, and largest, cookies in town. Perfect for a plane right back home.
B Patisserie is pretty close and is contender for the best Koign Amann in SF.
Marufuku is the newest ramen place in Japantown now and is quite good. I’ve not been, but Uji Time just north of the Japantown Mall, has crazy long lines on weekends for their taiyaki and soft serve. There’s also a new place specializing in green tea desserts in the northern first floor section to the main mall. To my dismay, it doesn’t opens until 12:30pm on Sundays. Speaking of matcha, Stonemill Matcha just opened in the Mission.