I have a quick story regarding the Hydra/Spetses discussion. In 1976 I was staying for the Fall season on Hydra with my 6 month old daughter. Coming back from Athens one day, I encountered a young American couple taking a holiday after the husband had completed a 3 month International residency program in pediatric at an Athens hospital. They were on their way to Spetses. Over a bottle of shared wine on the ferry (there were NO hydrofoils in those days) I tried to convince them they would enjoy Hydra much more. I told them what a mgical, transformative place it was. In a moment of bibulous enthusiasm, I even invited them to join me in the large house (Kellogg house) I was renting. They looked dubious at my spontaneous hospitality and I waved goodbye to them from the port as they continued on to Spetses. Next evening while shopping, who should I encounter in a local cafe, but the young American couple. "Oh," they said, "you were right, Spetses is nice but can't hold a candle to Hydra!" Laughing in assent, I said, "come and have lunch with me on my terrace and you can see how people on lovely Greek islands live during the Fall & Winter." And they did. They were planning on spending three more days on Hydra and then were off to his next posting in London for another 3 months.
So imagine my shock when I encountered the wife at a port-side cafe four days later, accompanied by a young French painter. "Oh," she said, "I really need to talk to you! You were right about this place! It is magical! I got so tired of schedules and hospitals and constant studies with my husband. I met Pierre here and he invited me to spend the winter with him (she was very attractive) and so I sent my husband on by himself. I don't know what he'll tell our parents, but I'm staying here!"
I found that to be a very typical Hydra experience, but couldn't help but feeling if I'd only kept quiet on the boat, and let them go on to Spetses they might still be happily married!