Welcome to Cruise Critic! If you'd like to participate on our forums by joining in the conversation, please Register Now! Be sure to visit our FAMOUS Roll Call forums, where you can meet other cruisers sailing with you and share a tour or shore excursion and SAVE MONEY!
The Marmotten is fantastic, we were there in 2000, but you might just want to check as I think it is closed for renovation. I know a lot of it's artwork is currently in Melbourne, but not sure when it will reopen.
Sorry, New to this. I spent time in Paris in both April and November. Not crowded, weather not too bad. I got a 5 day card that covered museums, bus, metro, even entrance to Versailles. Didn't have to wait in lines, even at Notre dame. You just walk to the front and show your pass. Definitely go to Muse D'Orsay (spelling?). Enjoy your trip.