The Musee d'Orsay is an impressive builing, M-I-L visited it and brought me back a book. I want to see it just because it looks so amazing, I'm not an art fan but love interesting buildings but each to their own. It looks the kind of place the kids might like for a bit - mine are happy if they have stairs they can run up and down
Might be worth a quick visit with a backout plan i.e. go and see what you want first
If you're veggie, don't read the next paragraph:
A couple of food things worth looking out for are rillettes (ree-ets) that are abit like a pate but quite fatty shredded meat, goose, rabbit and pork are very nice. Tartes au pommes/poire/etc. are sliced glazed apples, pears, etc. You often get them as part of a meal-deal. Rotiseries are another good choice for a quick meal, fresh roasted poultry with some fresh bread, they often have potatoes cooked in the fat dripping from the roatating birds, which are yummy.
I like the sound of the Louvre tour, it's massive so it'll tire the kids out. Notre Dam is very busy so booking a tour is a good idea.
The food is plentiful, loads of delis, bakeries, etc. dotted around - just keep an eye on the lunchtime closing! It's quite sudden, the shutters will just go down!
One place we liked was "Manhatten" or La Defense, the business district. It has the big cube arch and you
get great views from the top. There is a shopping centre there and the usual chains like MacDonalds and Starbucks but some really weird shapped buildings.
I've posted a PM with my flickr photos when DD was 1, some of the pictures might help decide one way or the other.
<a href="http://www.flickr.com/photos/johnmhunt/268804889/" title="IMG_1613 by johnny_boy, on Flickr"><img src="http://farm1.static.flickr.com/122/268804889_1bb922b3c1.jpg" width="500" height="333" alt="IMG_1613" /></a>