We visited Kefalonia in Summer 2011. We loved it there. I am a teacher but we found it wasn't too busy in August. We stayed in Lourdas. We would go back to Kefalonia but we'd like to visit another island.
I posted this in the general Greece forum and has one helpful reply. Any others ideas? We are looking for more adult resort, nice beaches and don't mind hiring a car to visit places. Good tavernas also a must!