The kids in my Greek School class love learning about Ancient Greece. They learn so much about the agora, art, schools, clothing, armies, and the Olympics. Their favorite activity is acting out the story of the naming of Athens and pretending to be Athena and Poseidon. Although I don't go into detail about the gods of Olympus, we do touch on them briefly.
For a Greek mythology go-fish game take a look at this link at Bogglesworldesl.com.
From alfavita.gr, a nice power point presentation on Ancient Greece, in Greek