Paris Tourism

What would you suggest a couple of tourists to see / where to go to Paris on a rainy day of summera

Museums, museums, museums!

Louvre
Musede d'Orsay
Galeries Lafayette
Notre Dame Cathedral and visit the underground museum Deportation in the gardens behind
Sit in a cafe and a good meal, people watch and enjoy the view.

Take the train to Versailles. The visit of the interior is worth seeing! Ifd it stopped raining, they also have a tram ride neat gardens