I do expect, however, that most of the uninhabitated Greek islands are too small to be useful for this. You would need 10-20 different stadiums, 2 km straight water to hold rowing events, and wouldn't want to have marathon runners, competitors in the 50 km walk, or those taking part in the cycling road race to do 1 km rounds. Let's say 100 square kilometers to host all the courses (except for sailing; there's plenty of sea for that), bare minimum.

Also, it would be a challenge to feed the competitors and the spectators on an island that size. Greece isn't known for its green islands, and looking at that list, I notice that, for example, Tinos and Paros, at around 200 square kilometers, have a population of less than 10,000.

I would think you would need something like Kos to host the Olympics, and even that would be an enormous challenge. The 'normal' population of around 33,000 would increase by 20,000+ competitors, officials and a zillion journalists, and you likely would have to ferry or fly in half a million spectators every day, and all of them would need food and drink, and working 3G.

Frankly, it is probably better to create a new island than trying to find an unused one.

Look at the BER disaster, it was supposed to open 2007 and most likely won't open until way after 2017.

I believe building a permanent Olympic site in Greece would bring similar delays...