If you find yourself in Paris with kids, please go visit Le Jardin d'Acclimatation. It's an oasis of play for kids and yet still manages to be peaceful and beautiful. Le Jardin has a small zoo, pony rides, roller coasters, two very beautiful playgrounds, a river, a cafe and of course, the quintessential French carousel.
Le Jardin d'Acclimatation is in the Neuilly area of Paris.
(Image credit: Le Jardin d'Acclimatation)