@anjelikaferrett we also went to Santorini on that island hopping,Mrs J reminds me.
I'm sure you will have a fabulous time and Mrs J very jealous as we haven't been to any of those 3 islands - reviews in due course please.
Kefalonia is beautiful but quite a big island and difficult to get around on public transport.
We are staying in the south and to get to Fiskardo in the north ( stunning) is tortuous.
However it is great for hoping as close to Ithaca ( one of our and Homer's faves) , Zakinthos , Lefkada and Corfu.
Talking about learning Greek reminds me of one of my happiest memories. We were hiking in Samos and were looking for a lunch spot in the hills when we came up on a remote village. The taverna had no menu and the patron didn't speak English so in my terrible Greek I asked him for some fish and explained that my wife was vegetarian. His eyes lit up and 20 minutes later brought her a delicious bean stew. He refused to allow me to pay for her meal saying that he had never heard a tourist speak Greek. I felt like the King of Samos for 24 hours!