Should travellers add Adelaide, Kangaroo Island or South Australia?
South Australia is worth adding when food, wine, wildlife, coast or a quieter city rhythm fits the trip. It is less convincing as another stop tacked onto an already crowded Sydney–Melbourne–Queensland route.
Answer
Adelaide can work as a calm food-and-wine city, with easy access to nearby wine regions and a softer pace than the eastern capitals. Kangaroo Island adds wildlife and coast, but it is not friction-free; it needs transport, time and a reason. South Australia is at its best when you want understated pleasures rather than another headline chase. If the route is already full, it is better saved than skimmed.