Foolishly, we did not sleep on the plane, but watched an old movie, Godfather III. Lots of people got killed and I think the Pope did it. Bullets were sprayed about like holy water. I digress.
We were determined to stay awake until 16:00, so grabbing a boat tour (which was part of our City Pass) seemed like a good plan. Wishful thinking.
As soon as we sat on the boat, I knew I would fall asleep, probably before shoving off. We had fortuitously chosen a vessel soon filled with Chinese tourists. Their method of moving about the boat, with a camera attached to their faces, required using the braille-hip method of getting from starboard to port, which jarred me regularly awake in time to see some of the important sights, like this big stone church.
The view of Paris from the river is fantastic, lined for miles with high stone walls, topped with the façades of countless palaces, chic hotels, imposing apartment buildings, and chubby tourists in garish pants. (The back end of any of these would diminish the effect substantially.)