re: Paris over Thanksgiving break...

Paris or Disney? Duh. Paris will be wonderful....while dusk will fall early, you'll get to walk around at night and enjoy the city in lights.

Weather will be cool and likely on the gray side, but who cares? You won't be competing with stupid crowds like in spring or summer, and you can eat your fill of lush, fatty foods. Markets will be full of fall produce (apples, etc).

How many kids/what ages? The sailboat pond in the Jardin du Luxembourg is great, simple fun for little ones.

If the kids are older and into US history at all, renting a car and taking a 2-3 day side trip to the D-Day beaches is a nice change from an all-city trip.

(I'm still scratching my head, trying to figure out who would prefer Disney on a holiday week over Paris.)

ETA: I like London at that time of year as well...