A good meal between DIA and the University of Denver
Hope this isn't too late to do you any good. Relatively close to DIA on Tower Road a bit south of Pena Blvd is DiCicco's with excellent Italian and pizzas, and an absolutely dazzling interior much like an Italian piazza. A bit further south is Moonlight Diner, also very good for diner fare. Google will easily lead you to either website.
(If you're doing the driving, get directions for getting back onto Pena Blvd from a local or waiter -- there's no ramp to get back on where you exited @ Tower Rd. Odd but true.)