TIP ME ABOUT PARIS!!

In the beginning of august I'm going to Paris with my mother.

I've been to Paris once two years ago, but that was only for two days, so I did'nt get the chance to experience Paris fully.

That's why I ask YOU to give me tips about almost anything I can

do or experience in Paris.

I would really appreciate tips about the flea markets, vintage shops, 

and just special, memorable places wether it's a shop, café, park, or something to do.

BTW, if anyone knows  about a fashion related place such as a museum, where I can see some fashion history, or some places I should visit related to fashion?