Bikerchick,

Not wanting to fuel your excitement at all, but was in Sydney this past weekend.
It's my second visit to the city (my first was a 3 week stay, so got to know the city quite well).
I can honestly say that Sydney is one of the most fantastic cities I've ever been to! I'm sure you'll have an absolute blast - 5 days is a nice length of time to see and do so much.
I would live there in a heartbeat - my sister lived there for 4 years and was gutted to leave.
I'll happily post you some Tim Tams if you pm your address!