If you happen to be in the Springs Back East Bar and Grill on Briar Village (they have/had a couple locations) is full of Bills fans.
Olympic Museum is just "okay", and the Air Force Academy is cool to see (not sure of access these days). Cheyenne Mountain Zoo is a pretty cool/unique zoo on the side of a mountain, has great views. I toured the Olympic Training Center about 15 years ago and that was awesome - not sure of access these days.
Garden of the Gods and Pikes Peak are definitely the biggest draws in town which you've already got on your list