Hi Tanya,
I live in Adelaide, so I'll give you some info about this part of the country. First I'll list places you can reach by public transportation:
1. At Bel Air National Park you you can easily see Koalas in the wild--I have also seen kangaroos and emus there, but not every time that I am there.
2. You can also see and pet wildlife at Cleland Wildlife Park
3. Morialta Park has some interesting waterfall, but if it is dry season there may not be any water.
4. Hahndorf, an old German town, is close by.
5. You can swim with dolphins, or just go dolphin watching at Glenelg.
6. You can snorkel near Noralunga.
If you have a car
1. You can see the little penguins down at Victor Harbor.
2. See mobs of Kangaroos on the coast at Deep Creek Conservation Park--some fabulous coastal hiking.
3. Visit the famous Barrosa, Clare Vale, or McLaren Vale Wine regions (tours also possible).
I am not a fan of Kangaroo Island. That being said, I do think the landscape is amazing, but the wildlife was a bit of a disappointment--except for the fur seals. You can not take car rentals over, and tours tend to be a bit pricey.
However, I do love the Grampians--we had Kangaroos eating all night outside of our cabin, and saw at least a dozen wallabies. The hiking was great and the rock formations were amazing. It probably will be busy in January. I also love the Flinders Ranges. I also love Eyer Peninsula, and you can read my blog about it.
Hope this helps!
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