Hi Dinky
Are you into hiking? I'm not much of a general guide, and can't claim to have been that many places in Europe (even if I've been everywhere along a continuous line!)
The southern half of France is great, good weather, well-marked long distance footpaths that go everywhere. Pyrenees fantastic; I've not done much in the Alps.
Corsica is an absolutely brilliant place to spend lots of time and I would highly recommend it.
One of the best places I've ever been was the Meteora monasteries in Northern Greece. The Pindos mountains nearby are also excellent.