The Love Boat (1977) : 6x18

The crew are in Greece working a cruise where a College is having its graduation ceremony. The Principal is attracted to a teacher who rebuffs him because he won't give a student a make-up test so he can graduate. And the student and a couple of his friends are hounding the Principal to do that. A prodigy is attracted to Vicki which doesn't make the Captain happy. And the valedictorian whose education was provided by his Greek aunt whom he assumed is wealthy but upon meeting her learns she's just a woman of humble means. And when she goes on board he doesn't tell anyone he's her aunt. And Isaac meets a woman who is estranged from her husband.