This past weekend G and I checked out the free Saturday at the Denver Art Museum. It was so cool to be able to experience this museum for free over the weekend. They have a free day every first Saturday of the month. It is free to view all of the exhibits except for the exhibitions which currently is Degas ($24 extra) We decided to get there about an hour before it closed and it was still pretty busy.
They have a couple of really cool collections right now including Drawn to Glamour with several fashion illustrations and clothing displays. They also have Stampede where they showcase animals in art which was really cool as well.
I highly recommend checking out the first free Saturday at the art museum if you have the chance.