As far as I know both countries were allies when it came to fighting Germany
Dress casual,comfortable shoes for walking,hiking,Acropolis has slipery marble stones in some areas,you can wear shorts with polo or simple t shirts,evening a pair of jeans or cotton trousers and a polo shirt or short sleeve shirt is normal.
Jimmy Carter is best known as a Washington outsider. One of the main reasons that his presidency was flawed, was his inability to solve the Iran hostage crisis in 1980.