Two cents

Kusadasi: At least 5 hrs to Ephesus and St. John's basalica, terrace house and what's remain of Artemis temple. Option: Mary's tomb. All those mentioned are at one place. Kusadasi itself offer little attraction;

Messina: If arrange well and have 6 hr to spare, can go to Taromina and Mt. Edna. If you do go to Mt. Edna, bring THICK cloth!!! Messina itself you can skip

Athens: Acropolis, Temple of Olympia Zesus. They are all at one place. Don't expect too much.