We dragged ourselves out of bed early to get to the only thing open that early and without lines: Pere Lachaise cemetery. 
We grabbed a baguette with ham, butter and gruyere, some coffee and got on the Metro. Pere Lachaise is everything you’ve heard. So many periods of architecture are represented by the graves and so many periods of art represented by the people buried there. We saw the requisites (Jim Morrison and its accompanying whiskey bottles and Oscar Wilde’s lipstick covered monument) and many more. 
Eating a baguette while walking through the cemetery at dawn is one of Sharon’s favorite memories of Paris.
Once again the tourist-unfriendly RER train system managed to get Chris twisted up and we found ourselves on a train to the suburbs. Express, no stops. Hello Juvisy! Fortunately we managed to navigate ourselves back without getting charged for the trip(s) but we had lost a valuable hour in the process.
We ended up at our destination: Le Musée des Égouts de Paris – The Paris sewer museum. This museum shows how the Paris sewer and water systems work. Ages ago they used the Seine to both dump their poop into and drink water from. Engineers developed sewer and water systems that the Parisians are very proud of. Proud enough to make a museum about it — a stinky, dark, damp museum. With a rat diorama and rat-related gifts at the gift shop. About a quarter of the way through Sharon said, “I forget, why did we want to come here?”.
We then went on another pointless expedition to find the Musee Dupuytren, a medical museum that is part of the University of Paris medical school. Closed for the winter school holidays! Steeeerike 3 in our medical itinerary! So we walked through the Latin Quarter (through the Sorbonne, past the Pantheon) and down Rue Mouffetard where Sharon found a toy store with her new favorite cartoon character, Barbapapa, a strange morphing blobby thing.
Took the metro to the Louvre station, which features a few replicas of Actual Art on display in the station — alas this would be our only encounter with the Louvre for this trip. We did walk through the gargantuan plaza with the iconic I. M. Pei glass pyramids. 
We headed through the Tuileries gardens (dead for the winter) to the Musee l’Orangerie which has the giant Monet waterlily paintings but which we abandoned as soon as we saw the line. We continued across the Place de la Concorde, which Chris is familiar with because of the views from TV when the Tour de France ends there every July. There was a huge ferris wheel and carousel set up to entertain the masses.
Then we nabbed a bus for the trip up the loooong Champs Elysees, ending up at the Arc de Triomphe. Sharon’s feet hurt too badly, but Chris climbed the stairs to see the view from the top, and wished he had more time to check out the awesome art exhibits that they had on display in the indoor galleries up there.
We went back to the Oberkampf area near our hotel for our final dinner in Paris. 
We were a little early (dinner wasn’t served until 7pm) so we had a bottle of wine and waited. For dinner we had an amazing steak au poivre and colossal prawns with butter sauce. We returned to the hotel and collapsed into bed.