ADELAIDE South Australia - What is most interesting to see?

Looking at taking a week off leaving Melbourne via Sorrento ferry, Otway Fly, Warrnambool, Mt Gambier (Blue Lake), Nelson, those caves crossing back over the border ... Adelaide maybe 2 days then return Mildura, Swan Hill etc.

Did a similar trip 40 years ago so I imagine quite a few changes.

Any suggestions?
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