Surprised myself by agreeing that La Rochelle and Ile de Re take a lot of beating but in France I think I would ultimately settle for Biarritz because I love the town and its proximity to the basques country and the pyrenees but its a toss up with Saint Cyprien Plage near Perpignan which has a totally different feel but many of the same advantages. Whatever, if I had to choose, I think I would end up in France.
For somewhere unlikely to get a mention the Polish Lakes take some beating and I love the Polish people but really I could think of 100 places in 10 different countries (at least) ...................
Reading this thread I can see I need to revisit Cyprus....and Greece....and.............