Ralf74: Try looking up thatsmelbourne.com.au , it has things that are on at the moment you can go and see like festivals and shows etc. I really don't go in there much but there are plenty of museums and the old melb gaol etc. There are also a fair few organised tours etc too I think.
dam Ralfy is that the best you could come up with
What sort of things are you looking for Belle?
arts,food,sport,wildlife,pubs/clubs,site seeing,shopping.....................
you get the idea !!