Jardin de Tuileries

http://www.davidlebovitz.com/2009/04/ten-great-things-to-do-with-kids/
Not only is this central and a great place to exhale after visiting the Louvre, but it’s a great place for kids. We love the fountain in the middle where you can rent a model sailboat. Also, in the summer time they set up a carnival with a ferris wheel, that gives the best views of Paris outside of the Pompidou’s rooftop bar.

http://www.lepetitparisguide.com/2009/05/jardin-de-tuileries-garden-of-tuileries.html
Little ones will also like riding the merry-go-round in the little wooded area of the garden.
One ride costs 2 euros, but since the tots under 3 are too small to ride alone, a parent/guardian is allowed to ride with them for free.

113 Rue de Rivoli - Louvre ja Concorde vahel  



http://www.nytimes.com/2013/08/04/travel/travel-guide-paris-for-kids.html?pagewanted=2&_r=1

The Tuileries Garden (Place de la Concorde, First Arrondissement) is one of the most kid-friendly spots in Paris, and also one of the most beautiful. While you delight in its symmetry and designer lounge chairs, your children will enjoy the in-ground trampolines, merry-go-round and enormous sculptural playground. Before leaving, walk to the park’s western edge to see the Luxor Obelisk, a 75-foot column (my kids call it the “giant crayon”) that once marked the entrance to the Luxor Temple in Egypt and now stands with an air of mysterious calm at the center of a swirling traffic circle.