If you want to go fly fishing, you might try a day trip to Poudre Canyon, and drive up to Estes Park. Smokin' Dave's BBQ in Estes Park is pretty righteous. You should be able to catch some trout on the Poudre in late October, and the drive is beautiful (even after the wildfire).
It's not too high elevation, and it's not too far from Denver.
Bayou Bob's (restaurant) in downtown Denver might be a place you could meet other Saints fans before or after the game. The menu is fairly limited, and the food is decent. I don't think they have buckets though, the only place you're going to get that here is Joe's Crab Shack.