Hi all. I will arrive on Paris at 8:20AM and then I will continue my flight and arrive 3:35PM at Venice. I'm thinking to get RER B from my Terminal 2E to the Saint Michel Notre Dame station. Then I will walk to Notre Dame Cathedral, Conciergerie, Louvre Museum, Tuileries Garden, Champs-Élysées street,
Arc de Triomphe, Trocadéro and Eiffel Tower. Just to see the city and take some photos. Then I will get RER C (Champ de Mars - Tour Eiffel) changing for RER B and come back to Airport Charles De Gaulle. Google Maps says that I can do that using 2 hours on normal walk. I have to arrive 2 hours before my boarding to Venice. My boarding time limit is 2:55PM. And I think is 1 hour to go using RER B and another 1 hour to come back using RER C/RER B. It is possible to do that? Or just the half? Or nothing? Thanks.