Plaka and Kolymbithres close the list because they're the comedown in the best sense — the beaches you go to not for a single remarkable photograph but for an entire day of actually swimming, reading, eating lunch under a tamarisk tree, and not fighting a boat schedule or a parking lot. Plaka, on Naxos, is one of the longest stretches of genuinely good swimming sand in the Cyclades, flat and shallow enough for anyone, long enough that you can walk away from the sunbed rows and still find a stretch to yourself. Kolymbithres, on Paros, trades Plaka's length for texture: granite boulders weathered into coves and sculpted pools, a beach with more personality per square meter than almost anywhere else on this list, minus the crowds that come with Sarakiniko-level fame.
They're last not because they're the weakest entries — they might be the most reliably enjoyable of the eight — but because they're the least urgent. You don't need to reroute a trip to see them the way you might for Balos or Elafonissi; you simply need to be on Naxos or Paros, which a huge number of Cyclades itineraries already include. The list ends on usability rather than spectacle, which is the honest note to end on: spectacle is what gets a beach onto a shortlist, but usability is what gets you to actually enjoy the day.
If you're cutting this list down for a shorter trip, protect Sarakiniko and Myrtos first — one for rarity, one for the best balance of drama and swimmability — and cut Navagio without guilt; the viewpoint photo exists online in better light than you'll get in person. Elafonissi and Balos should only make the cut if you're already committed to western Crete, since neither justifies a dedicated flight or ferry on its own.
Use this list the way it's built: as a sequence of increasingly practical questions. Start by asking whether you want to see something genuinely unrepeatable (Sarakiniko, Elafonissi, Balos). Then ask whether you want drama you can also swim in (Porto Katsiki, Myrtos). Decide for yourself whether Navagio's view is worth the boat queue. And wherever you land, save at least one day for Plaka or Kolymbithres — the beach day that actually works is still the point of a beach trip.