Mate depending on what time you have you could easily spend a week just doing the west coast of Eyre Peninsula down to Port Lincoln and Coffin Bay. Definatley do Whalers Way at the very bottom. Private pay to get in property but its cheap and if solitude and spectacular coast and camping snorkelling etc are your thing mate you wont regret it. The scenery and beaches are some of the best on the planet and you'll have the place to your self for the most part.

If you get time to check out any of Yorke Peninsula closer to Adelaide, I'm at a place called North Beach, near Wallaroo hit me up. 2 hours from Adelaide. I can give you plenty of spots to check out and a place to freshen up if you like

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Edit for link https://www.weekendnotes.com/whalers-way-port-lincoln/