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Stay away from big thermal gradients. World's best seeing sites often involve small islands in the middle of the ocean/sea, where temperatures are very stable. Places like Mauna Kea, Canary Islands and Crete (Greece). One such place in Oz, with reported exceptional seeing (*) is Exmouth in WA. Not quite an island, but surrounded by a warm, stable Indian ocean.
All suggested places in previous posts would be good for deep sky, but rather poor choice for planetary observation/imaging.
(*) reported by Anthony Wesley, so not hearsay
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