Go to the Westminster Butterfly pavilion. It's nearby, and you could be surrounded by a dazzling array of colorful flying fairy bugs like you wandered into a magical grove. Or not, up to you. If that doesn't sound cool, don't worry, we haven't gone yet either.
Go to the Denver Art Museum. Gail particularly likes the fifth floor, Asian Art. She also loves the Amitabha Buddha, and the stunning mandala sand painting.
The Kirkland Art Museum is super cool. It was a guy's house, he collected all sorts of art, like glassware, cool vintage furniture, and giant paintings people had to make while hanging from the ceiling. You'll like it.