Things to Do in Boulder

Here's a list of 'hidden gems' in Boulder, CO. It's a bit foghornable, but probably fun. Of if you were looking for some hiking in the area, I hear that they have that. The Indian Peaks area sounds especially nice.
Down south near Colorado Springs are several nice things. Pikes Peak and Garden of the Gods, of course, but also Cave of the Winds (I'd recommend the Lantern Tour). I'd skip the Royal Gorge as it's not worth the price.
I hear that Denver is a lot of fun but I never was able to spend time playing there...