A sushi place I would ABSOLUTELY recommend in Redwood City is this place called Seasonal Sushi 2432 Broadway (right across from the train station).
Go there when it is really nice outside, especially for lunch. It's right there on Broadway, quiet place, lots of outdoor seating.
The menu has $9 lunch that includes soup, salad and 4 (!!!) choices of different rolls - and the FOOD IS QUALITY, the service is fast too!
Absolutely recommended! Let me know what you think