Must agree with other WA'ers in the know. We go up to the cosmos centre three or so times a year during the warmer months. Great place and very friendly people and most important, no rushing. (the roll off roof needs to be seen to be believed!! Lots of extreme envy there.)
Last year they had a mock "Death of Pluto" day hosted by Peter Birch who was the head of the Perth Observatory a few years ago. We had a funeral procesion, piper and all and Pluto is still pride of place in a red silk lined casket inside the Gravity Centre.
Just an example of the other things they get up to out there.