Visiting Paris for the first time

Hello dear Paris internations!
I live and work in Vienna and coming to Paris for the first time for a short visit this weekend. Unfortunately, the weather does not appriciate my visit and it will be very cloudy and rainy. Could you please advise what kind of tours I can take on Sunday not to waste this day to the bad weather? I was thinking of some food tour as this is not too weather dependent.
Or perhaps, there is someone here who could show me the city a bit and share his or her pasion for Paris?