Speaking for the vegetarins that may be around....
For veggie burgers, there are 3 outstanding choices.
1. Flaming Grill Flaming Grill Cafe
2. Famous Burger
3. Squeeze Inn
For the non vegetarians, the Flaming Grill will excite you. They feature a dozen meat choices, including Beef, Buffalo, Elk, Alligator, etc. (as I wince).
For Vegans, you will love The Art of Food The Art of Food ! Living Cafe and Tonic Bar...
Try their vegan cheesecake for dessert.
For Mexican food, It's still touch to beat Jimboy's Tacos Jimboy's Tacos - Home
Locations all over the Sacramento area. They even have bean tacos and vegetarian dishes right on their menu. No more feeling awkward in a group specifying vegetarian varuations of otherwise meat dishes!
As for Italian, so many good places. But for the best place, you have to venture just a tad south to The Brick House in Elk Grove Brick House Restaurant & Lounge
Many vegetarian dishes and variations.