This is a helpful (and really beautiful) post of how to do Mykonos on your own:
http://boards.cruisecritic.com/showthread.php?t=1749395
The penny currently costs more to make than it is worth! Basically they aren't making any more but they will be accepted as currency while still in circulation. Electronic funds will still be to the nearest cent, but cash funds will now be rounded to the nearest nickel (at least I think that is how it will work). This is similar to a lot of places in Europe when I lived there (before the Euro).
Our bigger issue right now is they made the $20 and $50 bills out of a polymer blend, to make them more durable and harder to counterfeit. Problem is no machines can accept them!!!
For Athens, I am thinking about doing the Acropolis/other Athens highlights first thing, then a drive out to Corinth. I have found a few private tour companies, recommended on cruisecritic, who advertise this.
Anyone here ever been to Corinth? Do you think it would be overload? (Kids are older teens, who do like history/ruins.)