You should definitely consider going back to Australia... the Opera House is no where near the coolest thing there! Your next trip should include: Melbourne, Brisbane (...Byron Bay/Moreton Island are must sees), Townsville/Magnetic Island, Cairns, Alice Springs, Darwin, Ayers Rock in Uluru, Adelaide, etc. All of the surrounding suburbs of these cities are the best places to find subjects for photos! There are rainforests, mountain ranges (Glasshouse Mtns specifically), rivers, beaches, etc!