We were in Vegas for vacation with our 2.5 year old. She loved it here especially the water works room. She also loved the tower and slide. It's in a beautiful area...I initially went to the old location, the new place is much better. I would recommend going early since it fills up quick. We left around 11:30 and the line was out the door.
My five star rating is for the nap my daughter took after the museum!