i spent 2 fab summers working in Nantucket, i loved it, while there i visited Martha's a number of times, Nantucket is far nicer, way prettier, there are lovely parts to martha's but very dingy parts too, unlike with Nantucket. Nantucket has fab beaches everywhere, it's quant & very picturesque, now is a nice time it'll be buzzing there, starts to wind down end of the month, hire a moped & go around the island, gorg restaurants/bars, it's just got a lovely atmosphere there, the harbour with all the fancy boats is fab! as you can gather i loved it and must go back, i've great memories of the place, if there's a down side it's that it's pricey there but that's what makes it a class apart from Martha's, it's like old world! enjoy it, i'm green with the envy!