OP, you can take the RER B to Chatelet, walk up Rue Rivoli (long walk but you will pass by the Louvre) into Concord, then walk up the Champs to Rue Marbeuf, go right on Rue Marbeuf. Find a L'entrocote (you won't miss it, there will be a line) eat steak and fries. Then walk up George Cinq to the Champ again until you are at the Arch. Find Rue Kleber, walk until you reach Trocadero, walk down to the tower.
How about that for an itinerary. Sleep at a hotel next to the nearest RER B station go to the airport the next day. Oh don't forget to stock up on baguette and croissant for your commute back.