I am a man traveling alone. I have already purchased round trip airplane tickets to Athens, Greece, leaving the last Saturday in September, returning the second Saturday in October. My trip is 14 nights, one night on the airplane on the way to Greece, and 13 nights in Greece. I am trying to make up an itinerary for myself. I am NOT going to try driving in Greece. I want to see at least the following sites, more if time:
In Heraklion, Crete:
Historical museum of Crete
If time: the Venetian/ medieval fortresses, walking past various monuments, and so on.
National Gallery (Alexandros Soutzos museum)
If time, Palamidi fortress or other fortresses/ walk past other monuments or landmarks.
Mycenae site and museum. Probably will see as a day drip from Nafplion.
Acropolis area/ the Parthenon and the commonly visited old buildings,
National archaeological museum
If time: Benaki museum of greek history, museum of Cycladic art, Jewish museum, museum of popular musical instruments; possibly other museums if time or nothing else to do.
Delphi site and museum.
I arrive in Athens on a Sunday at 9:15am. I am thinking I will spend either 2 nights in Heraklion and take a ferry to Athens that leaves at 9pm on the third evening, or sleep in Heraklion and take an airplane to Athens on my first Wednesday in Greece then a bus to Nafplion, 3 nights in Nafplion; with a bus day trip to Mycenae; from Nafplion, bus to Athens for the rest of the trip, except on one of the days in Athens, a bus trip to Delphi, spending one night in the town of Delphi, then returning to Athens, spending at least one more night in Athens.
3 nights in Heraklion (or 2 nights + one night on a ferry) + 3 nights in Nafplion + 1 night in Delphi = 7 nights. 6 nights remaining.
My questions involve how many days to stay in each place and which order to see them in:
Should I take a ferry from Heraklion to Athens that leaves at 9pm or just sleep in Heraklion the extra night and take an airplane to Athens the next morning?
I am afraid I will feel like 6 nights in Athens is too many nights in one place, but I could be wrong. I don’t want to just wander the streets, feeling like a fool or feeling like I am wasting time, if I can help it. Should I add a night to Heraklion, add a night to Nafplion, take another day trip from Nafplion, add one or two nights to another place I haven’t thought to see yet, or find a day trip I can take by bus from Athens?
Should I divide my time in Athens into two hotels, the one I stay at before I go to Delphi, and the one I stay at after returning from Delphi? Or should I go straight from Nafplion to Delphi (the trip from Nafplion to Delphi or Delphi to Nafplion, takes almost 7 hours by bus and requires changing buses in Athens)? Or should I divide my time in Athens but return to the same hotel?
Alternatively, should I make Delphi my second destination after Heraklion, then see Athens, and worry about when to leave Athens for Nafplion and then return to Athens??
Bonus question: if I don’t know what else to do on an evening of my trip, what are the chances of me hearing/seeing an orchestra or other instrumental music?
Edit: to be clear, so far I have only purchased round trip tickets from the USA to Athens. I have not purchased any airplane, bus, or ferry tickets for travel between towns in Greece, but I am thinking of buying airplane tickets from Athens to Heraklion at least one way; I think I would prefer to only take a ferry if doing so at night, to save time.