Ya-sas jcfr22,
I have lived in Greece more specifically Chania, Crete for over 4 years. I am excited for your adventure to Greece. Wife and I are trying to get back out there June of 18'.
Great flight plan coming into Athens. I hope that you know that Downtown Athens is a long way from the Athens Airport. If you take the train expect at least 2 hours travel each way. I am not a big fan of Athens but the Parthenon and the Acropolis is fantastic to see. 1 day in Athens is really all you need.
One of the finest hotels in Athens as many diplomats and foreign leaders stay at the Grande Bretagne. I have found staying at the hotel at the airport has been extremely convenient. Being able to drop of the luggage and then go explore Athens took the toll off dragging all the luggage everywhere. Then the day of the flight out being at the airport for departure has prevented a lot of stress. The Grande Bretagne may offer a shuttle however I have never experienced that and even the drive takes some time to and from the airport.
Crete really is the best over all island. The people there are extremely hospitable and friendly. I would recommend just trying to learn a few Greek words/phrases. The attempt to speak Greek goes a long way. Fair warning Greeks do not have a bubble so when attempting to board a flight be ready for a mess of people just pushing each other in the most un orthodox manner.
The Blue Palace is a wonderful hotel with a great view of Spinalonga Island which is a must see if you are in the area. Take the time to read about the history of that Island before you go it is fascinating. There isn't much else to do in that area besides the good food and possibly a winery. The closest town is filled with Brits and tourist. If you are looking for a private romantic get away this is a solid choice.
If I were to recommend a place to stay it would be Chania or Rethymno on the western side of Crete. You will be able to experience much more of the Cretan culture in those locations and if you do rent a car you must go to elafinisi beach (a challenging drive) and the Balos Lagoon. These beaches are heavenly.
I would recommend taking the bus system to the town you want to go to and then renting a car locally. Driving in Crete is different. Locals drive aggressive and driving on the highway you basically drive on the shoulder unless you are passing someone. Below is the link to the public bus system.
https://rethymnon.com/TheBus-Bus-Ser...table.php?lg=2
Chania car rental I recommend is Horafakia Car Rentals +30-2821-039411
Ferry reservations I use viva.gr
I highly recommend buying the VIP seats.
If you don't feel comfortable buying on viva.gr a local travel agent can help you get the ferry tickets you need for no charge. Don't let them charge you a fee for buying the tickets. All they do is buy them off viva.gr and are able to print them on the spot.
Santorini is a special place. It has a magic feeling to it. Once you arrive at the port it will be hectic. Get your bags and get to the local bus that takes you to Fira. Once you get to Fira look for a scooter rental (if you or your significant other is comfortable renting a scooter) or a 4 wheeler. Hopefully your hotel can pick you up from the Fira bus station and get your bags. One of you will have to drive the scooter or 4 wheeler (not a 50cc either get something with a little power to get up the hills) and meet the other at the hotel. I highly recommend OIA! best sunsets, food, drinks, atmosphere on the island. Fira is a tourist trap. Enjoy your days at the many wineries, different beaches, ancient city of Akrotyri ruins and try to see a movie at the little outdoor movie theatre. Santorini is such a special place and is romantic just in itself. I have fallen in love in Santorini.
One last thing. You will have to use cash for most every transaction especially dining. Greece is a cash economy. So don't hesitate when you see an ATM and you don't have any EURO on you.
Any questions or concerns please don't hesitate to ask.