Greece

Here's a suggested itinerary for 5 days in Greece that meets your constraints:

Day 1: Athens

Start your adventure in Athens, the capital city of Greece. Begin your day by visiting the Acropolis, one of the most famous landmarks in Greece. You can also visit the Parthenon, the ancient temple dedicated to the goddess Athena. After that, head to the Plaka neighborhood, where you can find plenty of cheap and delicious food options. Try some traditional Greek dishes like moussaka, souvlaki, and tzatziki. In the evening, take a stroll around Monastiraki Square, where you can find street performers and vendors selling souvenirs.

Day 2: Delphi

Take a day trip to Delphi, a UNESCO World Heritage Site located about 2.5 hours from Athens. Delphi was considered the center of the ancient world and was home to the famous Oracle of Delphi. Explore the ruins of the Temple of Apollo and the Theater, and take in the stunning views of the surrounding mountains. You can also visit the Delphi Archaeological Museum to see artifacts from the site. For lunch, try some local specialties like feta cheese, olives, and grilled octopus.

Day 3: Santorini

Take a ferry from Athens to Santorini, one of the most beautiful islands in Greece. Spend the day exploring the island's stunning beaches, including Red Beach and Perissa Beach. You can also visit the ancient city of Akrotiri, which was buried by a volcanic eruption in the 17th century BC. In the evening, head to Oia to watch the sunset over the Aegean Sea. For dinner, try some fresh seafood at one of the island's many restaurants.

Day 4: Mykonos

Take a ferry from Santorini to Mykonos, another popular Greek island. Spend the day exploring the island's charming streets and alleys, which are lined with white-washed buildings and colorful flowers. You can also visit the famous windmills, which are a symbol of the island. For lunch, try some traditional Greek dishes like spanakopita (spinach pie) and dolmades (stuffed grape leaves). In the evening, head to Little Venice to watch the sunset over the sea.

Day 5: Athens

Take a ferry back to Athens and spend your last day exploring the city. Visit the National Archaeological Museum to see some of Greece's most important artifacts, including the Mask of Agamemnon. You can also visit the Ancient Agora, which was the center of political and social life in ancient Athens. For your last meal in Greece, try some traditional Greek street food like gyros or souvlaki.

I hope this itinerary gives you a good idea of what you can do in Greece in 5 days. Have a great trip!