As an Australian, money and distance wise I can agree, though, I think lack of planning and research may have led to boring experiences, Australia may be a young country but we have plenty of history. In Sydney Harbour we have old military bases and Gaols, Victoria has many old Gaols, gold mines, bush ranger history, Mountains for amazing hikes and treks, World famous events such as Melbourne cup and Grand Prix, Western Aus has some of the worlds nicest beaches. Queensland has Great beaches, reefs, rainforests, treks, wildlife and history, such as old trainlines, military bases, ww2 bombing sites, It has Uluru and the red desert and much more.Really, to have a great holiday you need to leave the cities and find your own journey. Seeing a roo, koala or emu in Australia zoo is no where near as good as seeing a wild one in Cairns or The Grampians. Leave the travel sites planners and find your own way around Australia.