In the comments we discover what became of two characters from the song Carey.
Stelios, who ran the Mermaid Cafe, is now living in California, running health food shops and selling water pumps to Africa.
Carey himself is "married with kids and working for an NGO doing financial consulting in third world countries or something like that" (update: he's on LinkedIn).
Here's the performance of Carey which Joni prefaces by telling their stories at length:
She tells another version of the same story at Carnegie Hall.
I went to Matala this year.
These are the caves:
And this the view of the town from the caves, undoubtedly more developed than in 1970: