Hey,
Bordeaux or Toulouse are nice town but you will find a lot of tourists in the summer.
For me the most beautiful castle are in the south, you can check this site to give you an overview :
http://www.payscathare.org/en There is not that much tourists there (except in Carcassone where it's crowdy)
And you can find museum everywhere I think.
There are much more other places intersting in France, it's hard to choose for you.
Personnaly I'm in Lyon. If you pass by I can make the guide for you

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moun a écrit:
"Salut, je suis champion du monde de rally sur coast !"
"Oui, c'est ca ! Et moi je suis champion de france d'island sur désert !"