One thing that constantly confused me in Paris were all the signs. They have a billion signs all pointing to the same place, but suddenly, your end destination disappears. This happened to me on the streets, in the metro stations, and constantly at the Louvre.
Otherwise, Paris is a beautiful city. I was lucky to be sent to Paris for a business trip earlier in April for an eSports event we were hosting. But obviously, it being a business trip meant that there was limited free time. So really, my coworker and I did everything we could in Paris over one Sunday.