September, Spring, is a good time to visit Cairns & D Barrier Reef as it sin't too hot. The rain forrest in Cairns is quite a haven for nature lovers and D Barrier Reef sure is one of Nature's Wonder. If you're into art and shows, Melbourne & Sydney both offer a variety of stage shows and both cities have a Casino and art galleries. Both cities also has a wide range of shopping malls and restaurants. If time permits, do the Bridge Climb of the iconic Harbour Bridge.