Unlike many Greek islands during the summer, you actually get to hear Greek spoken primarily! Sifnos is a pretty, comfortable and touristed island and favored mostly by well to do Greeks. Nightlife is emphasized here, and if that’s not your thing, eating is consistently an amazing experience. I didn’t have a mediocre meal once, and I’m fussy. Check out the breathtakingly situated bar in Castro run by a former sociology professor with a leaning towards the politics of his namesake.