We have a year round pass here for a reason.
Kids love coming here over and over again. Sometimes we don't go for a month and then everything is new and fun again. Go just for the outside garden/ animal deck on the top floor. One day just go to play in the art area, its hard to do it all in one visit.
No matter what the age of your child there is plenty to do here. There are some busy times that are just too loud for me, but most kids don't care.
There is a food place on the main floor which is decent pizza, snacks and drinks.
That's a plus so that you don't have to leave the building.
I would like to attend more of their special classes but unfortunatley they are often in the middle of the day. Not good for working mum's to be taking kids downtown.
Overall I would give the museum a B+
They always try hard to make each child have a good time.