Sure, here is a 6-day itinerary for your visit to Greece:

Day 1 and 2: Athens
- Explore the ancient Acropolis and its landmarks, such as the Parthenon, the Temple of Athena Nike, and the Erechtheion.
- Visit the Acropolis Museum, which houses many of the artifacts and sculptures from the Acropolis site.
- Stroll through the charming neighborhoods of Plaka and Monastiraki, known for their colorful streets and traditional Greek architecture.
- Exploring any attractions you missed on Day 1, such as the National Archaeological Museum or the Ancient Agora.
- Enjoy a traditional Greek meal in one of Athens' many tavernas 

Day 3: Delphi
- Take a day trip to the archaeological site of Delphi, a UNESCO World Heritage site located about 2.5 hours from Athens.
- Explore the ruins of the Temple of Apollo, the ancient theater, and the stadium.
- Visit the Delphi Archaeological Museum, which displays many of the artifacts found at the site.

Day 4: Santorini
- Take a morning flight to the beautiful island of Santorini.
- Explore the charming village of Oia, known for its stunning sunsets, white-washed buildings, and blue domes.
- Visit the ancient site of Akrotiri, a Minoan settlement that was buried by a volcanic eruption.

Day 5: Mykonos
- Take a ferry from Santorini to the popular island of Mykonos.
- Spend the day lounging on the beach or exploring the charming streets of Mykonos town, known for its windmills, cafes, and boutiques.

Day 6: Crete
- Take a morning flight to Crete, the largest island in Greece.
- Visit the ancient city of Knossos, the center of Minoan civilization and home to the famous Palace of Knossos.
- Explore the charming city of Chania, known for its Venetian harbor, narrow streets, and colorful buildings.

This itinerary includes visits to several of Greece's most famous attractions, as well as time on some of its beautiful islands. However, keep in mind that this itinerary may be hectic and require a lot of travel, so make sure to plan accordingly and adjust as needed.
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