Anything in particular you like to do?
In Sydney, I loved eating at Fish at the Rocks. The barramundi is their signature dish and ridiculously good. I can't wait to go back and have it again.
Go for a walk and stop at Ms Macquarie's chair for a view of both the opera house and bridge.
I love Melbourne. Great city. They have a Park Hyatt, if you want to use points at it.