I am here right now. Boulder isn't too bad of a town.
For pregame, head to the Milennium Hotel where there will be an ISU Alumni tailgate before the game--then just walk to the stadium after that.
In the next few days, I would suggest heading to Golden and touring the Coors Brewery and driving to the top of Lookout Mountain to see Buffalo Bill's grave. Then, head to Ft. Collins and hit the Fat Tire and New Belgium breweries.
In Boulder, we've heard that 'The Med' is the place to eat. We went there at 5 tonight, and it was a 2 hr wait--must be good (we didn't wait).