For me, this is the easiest question I could answer.
I would head directly to the Azure Coast. (I joke that every plane I get on lands in Nice.)
Yes, it is beautiful and yes, it has marvelous weather for much of the year and yes, the unique quality of the sunlight has attracted artists here since the beginning of the 20th century, but my favorite reason for going is the people who live there.
I know all the cliches about how rude and arrogant the French are, but I have been going to the South of France for more than 25 years, and I have never found any other place in the world where the people are kinder, warmer or more generous and hospitable.
I love to explore far-flung destinations, and I travel often. I have traveled in Asia, Africa, Europe and the Americas, but the only time that I get that pit-of-the stomach excitement is when I am off to Cannes, where I know that I will be with people who are consistently a joy to be with.