Do the GoldCoast.
Bring plenty of money and sleep as much as you can on the plane,
so you can wake up early to take the bus to the Worlds. Spent
at least 1 day in each world.
Bring Bikinis too so you can have fun at Seaworld too.
And be careful of sandflies bites. I ganna and my face
swelled so big and I was so uncomfortable, I didnt enjoy much.
Avoid those tours that means going to three places at
once. You wont have the time to enjoy it.
Go to Sunshine Coast and visit the reefs. (thats what the biknis
are for too.) Rent a car and drive there in the early
morning. Laze at the cafes when you are tired.
And if possible, get a service apartment, but avoid cooking,
since you wont have time to finish all the cooking oil, soy sauce
& condiments. Even for one week stay, you are better off
buying frozen stuffs to microwave and stay in when you dont feel
like going out.
Perth, I've been, except for the drive to Freementle market
& the other drive to the oldest town near Perth & the koala
zoo, there is not much there.