Hi Keith, I'm also Greek let me tell you
You have some excellent advice
from the board but, I'll give you mine,
First of all congratulations may you have a wonderful life together, remember happy wife
Happy house, any way, are you a history buff?
If you are, spent more time on the mainland,
Why? One day is not enough to see all the history, Olympia sounion meteora, epidavros
Delphi, all within driving distance from the center of Athens, righting the subway is a must some stations are like museums, and so much more, when you arrive at your hotel ask them about the one day cruise, is a three island cruise to Aigina, the Pistachio island best in the world, hydra, and Poros, I suggest you have lunch in hydra, walk towards the back streets and look for hidden jems,
Best food you will have in Greece,
Remember this is a relaxing trip, it will take one day it will cost about 130 euro each but it is well worth it,the acropolis museum is a must, so if I were you I'll spend 3 days in Athens, and the rest I would spend partying in Mykonos, maybe three days, and the rest in Santorini, to relax, don't rent a car in Santorini, take the bus, is slower but much safer, you will never see Greece in two weeks
It really takes years so, don't try,hope I helped!!
Oh and by the way,yes Greece is in turmoil
But, don't be afraid is still a thousand times safer then, any city in the US!! Enjoy!