I was recently here to see the Monet: Impressions of Life exhibit. It was excellent. It is a small Gallery but well worth your time and $15. There is no gamble here - you will get something back!
I saw the most amazing paintings currently on loan from Boston's Museum of Fine Art. I quite literally spent a good half hour just sitting and enjoying the paintings. Monet's use of texture with color to create the "impressions of life" is inspiring.
Lots of security in there. I guess they don't want any "Hangover"-like hijinks. I don't blame them. Since it is such a small space, however, it was a bit annoying. I'm just a girl from the Midwest who is enjoying Monet!
They have an audio tour you can get with your paid admission. As I told the front desk, I was looking for a quieter moment during my Vegas experience, so I passed. However, they seemed very informative. Several other patrons seemed to enjoy theirs.