Keep one day movable for the uninhabited island and northern coves that only make sense in settled weather
Polyaigos is the offshore day that justifies staying longer on Kimolos. The uninhabited island lies close by but has no visitor settlement, so a local cruise is about swimming, geology and the changing coast rather than ticking off a village. Routes vary with wind and operator: some circle Kimolos, others focus on Polyaigos, and a private speedboat is a different experience from a traditional excursion vessel.
Compare licensed operators by route, boat size, shade, toilet, flotation equipment and cancellation policy. Confirm again on the morning and accept the skipper's decision when conditions change. Bring reef-safe sun protection, a warm layer and medication for motion sickness if needed. Do not land where access is restricted, feed wildlife or leave waste. Keep this day away from an onward ferry because a shortened or cancelled cruise should be an inconvenience, not a missed connection.
Good to know
Polyaigos, Licensed boat, Swimming, Weather dependent, and Psathi