Adelaide is the capital and largest city of Southern Australia. It can be the starting point for nearby wine degustation in the Barossa Valley as well as long distance train rides to Melbourne-Sydney or Darwin (the Ghan).
Uluru (Ayers Rock) is a huge monolyte. Only 10% is above ground, the rest is below. The Rock is sacred for the original inhabitants of Australia - the Aboriginals. Since October 2019 it is no longer possible to climb to the top.
Barossa Valley, 1 hour North of Adelaide, is one of the main wine areas of Australia and probably in the world. It is fun to try some samples at the different vineyards without getting drunk. If lucky you can even go on a balloon ride and enjoy the views.
Coober Pedy is a "mining" town, sometimes called "the opal capital of the world". You may stay a night at a hotel here under ground (where it is cooler).
Alice Springs is located in the geographical heart of Australia, on the Ghan train route. The area has been inhabited for thousands of years by the original population of Australia. You can rent a 4WD or take a helicopter ride to Uluru.
Darwin is the place to be if you like nature and warmth. "Kakadu National Park" and crocodiles just around the corner. The Ghan starts here... This is the smallest provincial capital of Australia and quite close to Indonesia.
Kakadu National Park is a World Heritage Site in Northern Australia, approx. half the size of Switzerland. There are many crocodiles in the South-, East- and West Alligator Rivers.
Cairns is close to the Great Barrier Reef and therewith a center for diving and excursions.
The Great Barrier Reef is the largest coral reef in the world. It is approx. 2300 km long, the size of Germany or New Mexico and can be seen from outer space. A true Wonder of the Natural World.