This is probably the least visited state in Australia. The reason is mainly that there are no major attractions. At least such that the average tourist should see during just one month stay. If someone goes to South Australia, it is usually a transit journey.
Adelaide is a very quiet town. As for me, too quiet and too small to live, but good to visit. Pleasant centre, green botanical gardens, very nice beach in Glenelg (getting there by tram).
Only what I have to try in the future in Adelaide is an organized boat trip with the possibility of swimming with free dolphins! The cost of 98 AUD surely provide an unforgettable experience. The company guarantees the reimbursement if you do not encounter a dolphin. Only the water temperature may be a little discomfort, but they provide wetsuit. Trips are suspended during the winter.
Hitchhiking from Adelaide - towards Melbourne take the bus to Hahndorf and get off at the last bus stop before the start of the freeway, near the church. While hitch to Sydney, get the train to Gawler and walk 20 minutes to the Sturt Highway entry, the road A20.
Near the city is Barossa Valley, which produces some of the best wines in the country. But I'm not a big fan of wine and vineyards bore me after an hour. Maybe if I drank more wine, then I change my mind ...
However Hahndorf is the oldest German settlement in the region. Town has a nice atmosphere, great small houses architecture (as for Australia), delicious organic food, interesting shop exhibitions for tourists. It is a bit commercial, but still nice.
Popular tourist attraction is the nearby
Kangaroo Island . The island offers peace, coast with beaches and colourful cliffs, native Australian wildlife, lush vegetation. Unfortunately, the island is expensive – just a one way ferry costs $180 per car, one way flight from Adelaide $100, and car rentals on the island aren't the cheapest.
However, empty sandy wild coast can be visited in many places in South Australia. Only what we need is a car and not necessarily with four-wheel drive. At Christmas 2011 we rented a small car and visited Coorong NP. Near Goolwa town we have seen Murray mouth, where Australia's largest river flows into the ocean. Then the park extends for another 130 km, and then further south, the less water between the mainland and sandy peninsula.
For overnight stay I recommend a very pleasant Paranka spot, campsite No 2. It's located right on the lake shore with nearby lookouts. The next day I launched my rubber boat and paddled closer to the birds. In general, this park is a paradise for bird lovers. However, where the water already evaporated there were also beautiful view of white-pink-blue salt lakes glittering in the sun.
In spot called 28-miles is a beach crossing access, as well as in several other places in the park. But we did not have 4WD, so we left our car at the official campsite, we filled the self-service camping permit ($ 12 per vehicle) and then went on foot to the beach. Ocean, sand, wind – only for us. Empty. We pitched a tent, went for running, swimming (shallow water because of sharks), boiled dinner on the stove, and made champagne toast for the passing year wile watching the sunset. We had great New Year's Eve.
We also visited Victor Harbor. The water colour is stunning, in strong sun the ocean is green! From here you can walk on the bridge to Granite Island and hike around it for an hour. And in the evening at sunset time we went on a penguin tour. It was a real “hunting” for them - because 120 visitors divided into 5 groups were searching for a few birds. We have seen seven of them - this can not be compared with the Phillip Island in Victoria. However, our group was very fortunate because just when we were passing the burrow we have seen returning penguin parents who started feeding two young cubs. We watched the whole fight, scream, struggle for food. However, if we missed this scene, this tour wouldn't be good ($ 12).
At night we went for camping to a nearby Newland Head Conservation Park ($ 12 per car). There is a spectacular 2-hour trail (fast pace), which runs partly along the cliffs over the ocean (green route). It is part of the 1200 km Heysen Trail which leads through the most interesting part of the state.
For me, as usual, the most interesting part of Australia is outback. We can reach Flinders Range even by 2WD car, or join one of the few organized tours. Fortunately, there is so much space that you will not suffer from crowd. There are lots of hiking trails across the plains, mountains and gorges.
Leading north there is Strzelecki Track which is well maintained because of the trucks transporting natural gas. We chose this route for our tiny car, which caused huge smiles from 4WD vehicle owners. After all, our car was progressing. Details of my hiking trips in the Strzelecki Desert can be found here.
The road continues on to Innamincka, where we can see Dig Tree, place of the tragic death of Burke and Wills - one of the first explorers of the continent. Going even further, we get through Stony Desert to Australia's most beautiful sand ocean - Simpson Desert.
To see the largest lake in Australia unfortunately you have to have a larger vehicle. Eyre Lake only every 3-4 years is filled with water, and then it’s hard to get anywhere. Most of the time, however, the water completely evaporates and salt settles on the lake bed.
Coming from Port Augusta to Alice Springs we will pass through an interesting place called Coober Pedy. This is opal mining capital of the world. The town is a mixture of people from all over the world, people who are looking for adventure. Because to chose profession of precious stones seeker, living uncertainly from day to day, month to month, year to year, you must be a little crazy. And there are people who are able to invest their entire fortune in equipment and digging, digging, digging. Maybe will be succeed. In the Coober Pedy area there is located over a quarter million dug wells (I slept in my tent in wild in one of them). Some of these 
micro-mines were converted into apartments. Whether summer or winter, in these underground houses constant, pleasant, room temperature remain. If you stay here overnight I recommend one of those underground hostels. Bed in the dormitory costs from 30 AUD.
A high fence Dingo fence is crossing the main road a little further north of Coober Pedy. It is the longest fence in the world. Construction was completed in 1885, and the total length of the fence was more than 5.6 thousand kilometres. This is the distance almost from London to Tehran. The task it had it was to prevent southern states domestic animals against the wild dogs. That plan was partly successful and you won’t meet many dingos in New South Wales.