I. LOVE. FRANCE. i've been to the cote d'azur, and basically everywhere between marseille and the italian border. but seriously, GO to corsica. it's absolutely the most beautiful place i've ever been to. one of the most stunning towns i've been to is called eze. completely worth it.
the beaches pretty much on the south are all pretty much crazy blue. the beach in nice is rocks i think. but who cares. the architecture is stunning, and just everything about it.
if you end up more north, there's definitely much more stunning things to see. i didn't have the chance to go further than where i did but if you go to a museum, go to the louvre in paris, OBVIOUSLY. i hear you definitely can't see it in a day, or even a week possibly, but they have the majority of a lot of major paintings and stuff, by a lot of very important artists. if you love traveling, france should be something very special. knowing french obviously helps...