We were in Vegas for a few days last month with the little guy (2 years old) and wanted to spend the days doing things that he would like.
He loooved this place!!! He is pretty into pirates so the big pirate ship with all the different activities was perfect for him. He also had fun in the toddler room and grocery area. He loved climbing up the huge play structure playing instruments, going down the slides, etc.
I would say though that he was in love with the water area. He spent a solid hour and half in there... If you have a toddler you know that anything keeping their attention for more than 5 minutes is gold!! I would recommend making sure that you bring a complete spare set of clothes if your child loves water like mine. He was soaked from his head to his toes. They do provide smocks but he spent so much time in there that it didn't matter anymore.
Anytime we are in Vegas with the kiddos we will be back!!!