I ended up doing the batobus. I was going to take the metro to the Arc de Triomphe and then catch the batobus around and take the metro from the eiffel tower. On the plane, I met up with a nonrev and he told me that Notre Dame was on the same line as the airport so I could avoid a transfer. I took the metro to Notre Dame, then got on the Batobus. It comes by every 20 minutes, so I got off for 20 minutes at the Champs-Elysees stop. Then I got off at the Eiffel Tower for an hour. It was supposed to be 40 minutes but the boat left a little early so I didn't make it down in time. I made it from the river, up to the Eiffel Tower, took the steps to the first level, went around and took pictures and got back down the steps and to the river in 35 minutes. I wish ?I'd had time to make it to the 2nd level but there was no way. Got off the boat at Notre Dame and took the metro back to the airport. We had a brief scare when it had a small maintenance issue but got to the gate right as they were starting to board. Got first class both ways. I was in the country for less than 8 hours and away from home for only 34. Whirlwind trip for sure but worth it!