I know you said a day but what time of day do you arrive? CDG is out of the city, so you will have to grab the RER. I would suggest staying by Montmartre, its close to Gare du Nord where the RER stops. If you want to see the sights, try out a hop on, hop off. You can take the tour all at once, or hop off, spend extra time at certain attractions and grab the next bus to resume the tour.
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