Sure, parts of Sacramento are as flat as the world before 1492. But then again there's always the foothills.
Runners have a wide variety of surfaces to run on in and around Sacramento.
Even the American River Bike Trail offers some hills. Okay, none of those hills are exactly snowcapped, but saying you don't run because the topography is boring is a cop out. If you live in the foothills, you have plenty of hills to climb for that extra burn. But you don't have too many established or easily-accessible trails to train on like the flatlanders enjoy. The point is, get out and enjoy whatever topography you have around your home or place of business.