The food is good and cheap and they have a variety of beers including a great guiness and coopers ale. Of course the other great places I enjoy are outdoor places in Queens land including North Shore, Fraser Island, Strady, Nth Qld. Adelaide is one of the best Australian cities if you like food, wine and culture and don't want to pay a fortune. Getting around by bicycle is great and easy. The Adelaide Hills are great to ride in - no traffic, some wineries and cafes are springing up all over the place.
Scuba diving is good here too .
You'll see things you can't at the Great Barrier Reef. The York Peninsula and Kangaroo Island are possibly the best places. Diving off Adelaide itself not too bad. Plenty of fish around artificial reefs and wrecks. My suggestion that Adelaide is different to Sydney and Melbourne relates to the smaller population, lower prices for accommodation and ease in getting out of the city.