Okay casino. Usually lively with younger people. I usually only come here for a couple of reasons: (1) get some NY pizza - they have some good stuff (or at least used to), (2) grab a beer at the Irish Pub, or (3) someone I came with wants to go see cheesy woman bartenders dance on the bar at Coyote Ugly. It is conveniently connected to MGM and Treasure Island via walkways.
Bottom line: Go for the NYC pizza and Irish beer. The roller coaster is not bad too if you've never done it.