Anyone know?

The only Greek filming location was Mykonos.

It was filmed on Mykonos as mentioned above.
The hotel where Shirley stayed was the Manoulas Beach - scenes fimed in restaurant, room , halls etc.
Hotel still exists today - much larger due to its fame and with much renovation , but still resembles that shown in the film.
The Cafe on the beach where Shirley watches the sun, meets her Greek and later working there is just down at the water edge from the Manoulas- looked better in the film- some renovations until today.

The beach known as " Shirley valentine Beach " is now where the deluxe Hotel Mykonos Grand is located.

All are just a few kilpmtres from Mykonos town , also seen numerous times in the film- buildings about the same there as I remember it

The boat named Noah can still be found under many alias.

If you are a fan of the film- fun to look at the places - although the years pass by , you can still recognize much from the film.

Thanks so much. Brilliant replies.

I always have liked the film and Mykonos , so I learned a little about the places on Mykonos.

Tom Conti, the Scottish actor that played the Greek, did a great job.

Just watched the movie last nite!! (Wish I had seen this post before.)