Have you thought about calling one of those ghost tours and asking them if they would cater to a small group of people for a wedding? I have seen on TV a tour in the Brissie area that went to one of the cemetary's, and there is the one that does the Rocks in Sydney as well..If you google for Ghost tours, you should find something....some of them even do hens night's i think.

You could tie a ghost theme tour in with a ghost theme fancy dress wedding celebration too

Nic