DAY1: (March 31, 2012)
Arrival from Switzerland 1230pm - Gare Lyon
Check-in hotel (near Charles de Gaulle)
- LUNCH -
Montemarte
Sacre Coeur
Moulin Rouge

DAY2:
Champs Elysees
Arc de Triomphe
Palais de la Découverte
- SHOPPING -
Eiffel Tower
Seine River cruise

DAY3:
Louvre
Jardin des Tuileries?
Faubourg St-Honoré- Goyard
Chanel- Rue Cambon
Galleries La Fayette
Printremps

DAY4:
Palace of Versailles
Notre Dame
Sainte Chapelle

DAY5:
Musee Orsay
Eurostar 5pm to London

Why the hotel near the airport?

Day 4 is kind of packed with ticketed sites. If you go to Versailles first, can I assume it'll be very early to beat the tour bus crowds? I'd also assume you won't be touring Marie's Hameau and the gardens? To get back to Paris and see BOTH Notre Dame and St. Chappelle and see the outside areas at Versailles will be very difficult, time-wise.

Without looking further I'm wondering the same thing. Why are you staying near the airport?

Or do you mean near the Etoile metro which is also known as CdG-Etoile? If so, Etoile is a better way to identify the location or, better yet, near Arch of Triumph.

The itinerary looks good. Have you checked opening days for thing like Versailles, Louvre, Orsay to ensure you don't arrive when they're closed.

I've done Versailles and the Eiffel Tower in the same day (Versailles first) as they're on the same RER line and the ET stays open late. You could switch the ET with ND & Ste-Chapelle. Notre Dame does not need a ticket as it's a church and I've never waited more than a few minutes to go through security at Ste-Chapelle. If you don't want to see everything at Versailles then you'll be fine on day 4.

Another vote for not staying near the airport if that is what you mean.

Check-list tourism -- how exhausting! Day 3, for instance, is impossible unless you intend to simply walk, or maybe jog, around these landmarks for a glance from the outside. The Louvre is an immense sprawl of glory. If you go only there for a half-day you will still barely get a taste of its splendour. The two large department stores are convenient neighbours but if you expect to actually find the goods -- in other words, shop -- you will trudge long and bewildering distances. Neither of these sound like a good time to me. You certainly will be in no shape the next day to travel all the way to Versailles and get back in time for two other stops. Slow down, get into the rhythm of the city, enjoy and understand no more than two destinations a day.

Your first day will not go well if you think you can check in that soon. I'd get lunch as soon as I arrived- drag bags to nearby cafe. Enjoy and then go to hotel. Check in is usually after 3pm if not later.
Also, Moulin Rouge is a tourist trap.
Why not do some low intensity sites- Eiffel tower, Seine Cruise, maybe do some shopping.

Even if you can't check in right away you can leave your bags at the hotel. No need to bring them with you to a cafe.

Swap the louvre with musee d'orsay. I liked the orsay much better, but the louvre and gardens are super massive and worth taking time for. Moulin rouge is a dinky little tourist trap, but you will regret not having a picture of it, at least. Plus it's in the neighborhood with everything else. I loved the lapin agile too, next to the vineyards. Cool area.

The Siene river cruise is interesting. We took it at night, which is beautiful, but not picture friendly. Take it at day and walk around leisurely at night.

And, yes I'm the minority here, but I thought versille was so overrated and boring. Give me a baguette and cheese and a park and the Rodin museum and pretty much another part of Paris, but please don't make me ever go back there...

If you are dining with friends head here:
http://www.yelp.com/biz/nos-ancêtres...aulois-paris-4
For one of your dinners. I'm certain it's touristy, I'm certain it's a little expensive, but we just had so much fun. Unlimited wine, a basket of vegetables you chop into a salad, 1500 other courses, great atmosphere, jolly customers. Best food I ate in Paris? No, but certainly made our trip fun.

Also the arc de triomphe and the eiffle tower should be done one during the day, one at night. They both give stunning views of the city, so you will probably enjoy having both perspectives.

Thanks for all the comments/tips.

And yes, our hotel is near CDG-Etoile and Argentine station.

Regarding what Freda said: It has never been my experience, in hundreds of Paris hotel bookings, that the hotel wouldn't hold my bags until check-in time. You absolutely do not need to drag your suitcases to a café and wait. Also, I've never booked a hotel room in Paris that made anyone wait until 3 pm. Usually it's around noon.

I agree, I can't imagine any hotel that wouldn't let you leave bags there until checkin (except a hostel or maybe 1* hotel or something like that). I've usually been able to check in before noon, but sometimes not until 1-2 pm.

Your itinerary looks fine, actually. The only thing that could be too much is going to ND and Ste Chapelle on the same day as Versailles. If it were just the church, fine, you can walk in and look around a bit, but Ste Chapelle can take some time, waiting in line if nothing else. Ste Chapelle is only open until 6 pm, but that would mean you'd have to leave Versailles maybe around 3 pm at latest to make sure you did all that. If you get there first thing, that could be enough for you there, sure. I myself would just not want to do more sightseeing that day, but you may hve more stamina than I do.