Is 10 days enough for Turkey?
Ten days is enough for a strong Turkey trip, not a complete one. Choose Istanbul plus either Cappadocia or the coast, and add the third only if the transport actually protects your days.
Answer
With 10 days, the best Turkey trip is edited early. Istanbul plus Cappadocia gives city texture, food, history and a landscape shift without forcing the coast into the margins. Istanbul plus the Aegean or Turquoise Coast gives a slower, warmer route with ruins, boats and late dinners. Istanbul, Cappadocia and the coast can work, but only if transfers line up and you accept fewer slow days. The trip starts to fray when every place gets two rushed nights and every morning begins with a suitcase. Turkey is generous, but it does not reward pretending all regions sit next door to each other.