Paris Museum Pass

If I only had 1 day in Paris it would most definitely NOT be spent in a museum!

My first impulse is are you crazy,, of course its not worth it,, but then , on pause, I think it really depends on what you want to see. You already are going to see and enjoy the Eiffel Tower. So theres 1.5 hours or so,, then lunch perhaps, 1.5 hours, now what,, a museum, which one. The lines are museums are not all horrendus and many are avoidable. If your one choice is the Louvre, absolutely do not get the pass.. I promise you can get inside, within 15 minutes max,, no matter when you go.. I personally have never waited more then 10 or so, and I have gone 8 or 9 times now, and always in high season. Simply use alternate entrances and buy tickets from machine. Viola. Cluny( Medival Museum) , Invalids( Army Museum and Napoleons Tomb) , lines not an issue. The Towers of Notre Dame are the worst,, the Museum pass will be accepted for admittance price, but, will not give you line skipping there, and that is one slow slow line( they only let 20 people up at once) You can pretty well forget seeing them unless you get there early before they open and line up. The Church of ND is free of course, and there are long lines, but the lines move quickly( its basicallly just a bottle neck to get in) So that leaves a few places where lines will be long , the Orsay, there are ways to avoid lines there, but not if just there for the day( advance ticket purchase) , and I understand the Rodin is closed right now, but normally you go there first, and purchase a one day combo ticket for Orsay and Rodin, must be used on same day, and will allow you to skip line at Orsay, lines rarely much of an issue at the Rodin.
The Orangerie,, i have never bothered, I do not care for impressionism( hey, just squint and look at other art, viola) but I do understand lines can be long there. so basically, what is your plan?

here's what we were thinking we arrive at 10:17 a.m. and leave at 9:13 p.m. Notre Dame first (maybe if possible) quick in and out at Sainte Chapelle
Lourve quickly. see a few highlights and peace out. lunch see the arc de Triomphe and take pics eiffel tower tour time is 5:30 p.m. head back to eurostar

What Pat said, no pass. Between the line at the Notre Dame tower and the one at St Chapelle, you're not going to get in both. Otherwise it looks good. Also, you won't need a fist full of metro tickets - - one up to the Arc and one after the ET.

thanks so much for the input thus far!!! Very much appreciated!!

From Notre Dame you can walk to Louvre ,,walk through the Tuilleries, onto Place Concorde, and up Champs to Arc,, ( the Champs sucks, but you get a nice view of Arc) then take metro to ET, then metro back from ET,, two tickets.. To enter Louvre walk along the Rue Du Rivoli, enter where the awning says Caroseul Shopping Malll, go down stairs, purchase tickets from machine, walk through the mall , through security , and your in,, 15 minute from start to finish. For Notre Dame, assume you mean church not towers,, Towers lines hours long. St Chapelle, well good luck to you , lines there do tend to take awhile. Ps what day of week are you going, Louvre and Orsay are open some evenings, if you are there a night the Orsay is open it might be worth trying to go,, its queiter then .

My only quibble with Pat would be that it's a couple of miles slightly uphill from the Louver to the Arch and only a mile slighly downhill from there to the ET. I ain't about to quibble with the Champs sucking big time.

No need to pre order if you do plan on getting the passes. Because after you have cleared security in London and while you are waiting for your Eurostar train to load you can buy your "carnet" of Metro tickets (and even Paris museum passes) and be ready to hit Paris running. I did this last summer and went straight to the Metro to get to my hotel. It saved looking around for the place to buy them in Paris. They made a P.A. announcement which is how I found out about it.
Also study a metro map and know where you want to go and which metro line to take to get there. Robert

Shunta, Just to be sure you are aware. You will be on the 7:01 Eurostar from St Pancras International to Paris. There is a minimum 30 minute mandatory check in time on all Eurostar train trips, both at London and Paris (and Brussels for the other readers). During that time you will be checked in, security screened, and sent to the departure lounge. That 30 minutes starts when your ticket goes through the machine or you scan the VR code on your phone at the entry point. Any queuing time you have (being in line) waiting to check in doesn't count. I have personal experience that the 7:01 is usually a Very Busy train, usually sold out. You will almost certainly need more than 30 minutes. That means being in the queue before 6:30. If you miss the 30 minute cutoff you don't travel. Just giving fair warning....