Kids all cultured out? Take them to Aquaboulevard for the day (near metro Balard, southwest Paris) to let off some steam.
It's a great swimming complex with pools and hot-tubs, wave-machines, water-sprays, flumes you go down in inflatable boats, mini-golf, a "beach", and poolside cafes where you sit in your bathing-suit ... outdoor swimming is lovely and so are the outdoor hot tubs. It was the hit of our holiday.
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The suggestion is to combine the visit with a trip to Versailles (south west of Paris). Aquaboulevard is 10-15 minutes' walk from Boulevard Victor (RER line Line C).
Warning is that there is a strictly enforced rule that outlaws swim shorts. We were forced to purchase swim slips from a vending machine in the complex.