Since I really like the Beatles, I had a great time watching "Love" at the Mirage.
"O" at the Bellagio and "Ka" were also ok in my opinion, but overpriced (especially since there were lots of reduced price seats available for "Love" back in January).
Besides that I had a great time at the "Thomas & Mack Center" watching UNLV vs Wyoming, although the game itself was pretty boring (and Wyoming sucked). But that's not really a show, so...
Personally, I'm looking forward to watching 1-3 games by the 51s (hopefully a somewhat decent AAA-team) in June and maybe "Lion King" over at the Mandalay Bay...