The Red Pepper is a great place to go. Order at the counter, the food is made to order, and you should be able to get out of there spending less than $10. Get an everything grinder and throw some extra white sauce on it. Go there for lunch one of the days. The Parrots Cay is a hole in the wall kind of place but has very good wings. As was stated earlier, they don't open til 4:30 and you need to get there early to get a seat because it's small and very popular on hockey nights. Also, I'm not sure whether under-21 year olds are allowed in the Cay. Other places to consider are the Blue Moose (get the spinach-queso dip for an app) and Whiteys in East Grand Forks (both are right across the road from Cabela's if your an outdoorsy person) and Rhombus (pizza) in downtown Grand Forks. If you wanna play it safe and just hit up the chain restaurants, those are pretty much all located on 32nd Ave or on Columbia Road near 32nd Ave. For breakfast hit up the cafe in the Flying J truckstop (south end of town just off the interstate) or Gramma Butterwicks on Washington St. The Aaltos Cafe in the Canad Inn actually has a pretty decent breakfast also.
If you're looking for more expensive dining, hit up the Toasted Frog or Sanders, both in downtown Grand Forks. (My opinion, Toasted Frog is better and cheaper, but must be 21)
Personally, I've never understood why anybody goes to the Italian Moon......