ManosK:Re Zakynthos have never been there but from what I have heard from a few Greek friends who been there not very long ago, this is NOT A VERY NICE PLACE to go for a holiday!
Id disagree with that having been there for the last 2 years for 2 weeks at a time. I find it a nice place with nice scenery, plenty to do and cheap easy access to the mainland via the subsidised ferries meaning trips to Olympia and others are quick and easy.
I couldnt see anything wrong with it as a destination hence me already having been there twice (other than the chaos at the small ill equipped airport that is).