You're going to love Denver and Coors Field. The stadium layout is fantastic. I personally like sitting in left field, but there isn't a bad seat in the park. Get some Rocky Mountain Oysters if you aren't a scared little she-bitch. Delish!
If you like tasty dead animals on a plate, you MUST eat at the Buckhorn Exchange in downtown. Oldest steakhouse in Colorado (1893) and they serve all kinds of critters. It's not cheap, but its entirely worth it. Link:
http://buckhorn.com/And if your a fan of South Park, you also gotta visit Casa Bonita to watch the dive show, which is a total trip and mind fvck. Just DO NOT eat there. The food makes Taco Bell look like a 5 star Michelin restaurant.