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About 600 Miles of the best bits - as dictated by my prejudices. 3 days would be ambitious.
Mizen head, a taste of Sheep's head, Priests leap, Healy pass, Dursey cable car, Ballighabeama & Ballaghoisin, Skellig ring, Valentia island, Slea head, Conor pass, Clare (worth a look especially Black head). Go on, go on, go on, go on, go on.