[toyboy]

In Cairns you can do Great Barrier Reef tours, go to Green Island, head along up to Port Douglas , do tours up inthe hinderlands out of cairns, plenty to do or sit back and enjoy it with a few beers. Fraser Island is a must, beautiful sand Island covered in ferns,palms, fresh water lakes, dingos as well.
you shouldn't get bored at all, heaps around to do and see and drink, I'll let some other put some ideas in, other that enjoy your visit down under.