Kyprianos,
Great post - very informative. You should write a "Greek Islands Pilot's Guide", I am sure I would not be alone in buying a copy.
The pictures you posted have certainly whetted my appetite for visiting the islands - great to know who has AVGAS and who doesn't.
I will be at Preveza in my Mooney in August and may take in Santorini as a day trip.
Well done,
SB