We have been going to the children's phoenix muesum for years. They have areas for babies, toddlers and school age children.
As other reviews suggested they have free days but you will have to wait a minute but it's still free to a pretty fun place. You can also buy discounted tickets on apps like groupon and living social.
The musuem also does adult nights. They have a glow night coming up august 12th for 21 and older. They have also done prom nights.