Bring a blanket and let's play and chat for a little while. The square is just inside the Tuileries on the right if you enter at Place du Carrousel. It's near the Arc and the Paul's food truck. It's nice and shady and fairly quiet in the mornings. The square is a little bit hidden but if you're standing at the Arc facing the Louvre it's behind the trees to your left. There is a ramp if you have a buggy, just follow the path. We met here recently and afterwards the older kids went down to the playground for a little while (the babies went home to nap).