Just one word - Paris!
Gorgeous and beautiful city! Everyone should visit Paris, at least for once in their lives. I don't want to tell you what you need to see there (I just can say EVERYTHING!!), but everyone decides for himself that he is interested. It's all up to you!
But definitely you have to try croissant,bread and french soups. If you are cooking at home, you can find the supermarket Auchan. The prices there quite normal and you can find there everything you need. If you don't have a car, of course the best way to get to some...