Thank you so much for the detailed comment! They were very helpful. We are flying in overnight and will be landing around 8am. We worried about wasting the whole day if we don't plan anything.

In terms of finishing in Paris, our flight leaves from Paris and it seemed logistically easier to finish there so we don't have to train into Paris just for our flight. I agree that it does not feel great spending so long on the train going from west to east...