The first year I went to Greece was to Kos in 1988 on a brand new Air 2000 Boeing 757.
We sunbathed during the day, Greece has many sandy beaches and good weather.
At night we drank a lot of booze, it was much cheaper then with the good old Drachma. We had a meal at a taverna as well.
We went with another couple and because we were young we had a competition to see who could do it most. We kept a score on the bedroom mirror with lipstick. I won, but I cheated.
Zante is a nice island where you will be able to do all the things I have suggested.
Hope you have a good time.