Simon's Cafe on 16th downtown. If you happen to be a duck hunter, they are pretty famous for cooking your game Chinese style and serving up a full on dinner! Certainly not a fancy place, but a ton of fun when you bring them your ducks!
I like Squeeze Inn for burgers. Freakin' delicious.
Not hot on Hop Sings. They put my family in the back of the restaurant on a busy night and ignored us for well over half an hour. We didnt even get food till a good hour into the trip and it wasnt that good.
Chicago Fire is amazing pizza in a very cool setting. I like it a lot.
Good seafood can be had at Joe's Crab Shack in Old Sac. Very busy though. Definitely make reservations.
i may be slow sometimes but ive just discovered for myself Chipotle. i love this place. the cilantro lime rice especially. there are several throughout the sac area but the one i usually go to with my wife is across from the sunrise mall. some would say its a little pricey for the kind of restaurant it is but i think its quite reasonable for the portions.