The first night:
I started off the day early with a trip to the Musee d’Orsay. The doors open at 9:30AM and I got there around 10AM and the line was already long. Get there as early as possible since when I left around 1pm it was quite crowded. Free for EU residents 18 to 25 and discount 9€ from 12 € if you are under 25. Otherwise it just costs 12. Stunning museum in an old train station. The architecture alone makes it worth the admission price, but the impressionist paintings on the 5th floor and the sculptures on the first and second floor make it even better. It is definitely a museum to see in Paris if you have already been to the Louvre. I spent about 2 hours there looking through the impressionist paintings and the sculptures and maybe spent about 30 minutes on the rest of the museum.