There is playground by Place du Mont Blanc, by the Alpina centre, suitable for toddlers and children, and a small one further up the river towards the sports centre which is best suited for toddlers.
Just across from the Montenvers train station you will find the Chamonix Leisure Park at Les Planards – an action packed fun area that is a magnet for children and families in the summer and winter months. There are two playgrounds here, one for kids up to three years old, and one for 3-12 year olds. Little ones can bounce on the safely enclosed trampolines (4-12 years), clamber on the adventure climbing frame or ride round the mini go-cart track. The most exciting thing here is the luge. Open in both summer and winter, you are strapped into a sled and towed up to the top before enjoying a thrilling ride down the 1300m track - suitable for those three years old and over.
Up in Les Praz, there is a playground behind the Hotel Lanchers. A more exciting option during the summer months is the Paradis des Praz, which you will find up by the golf course. This is a natural outdoor play area in the woods, with swings, a slide, a zip wire, and a stream with a bridge. There is a cafe, a bathroom, and pony rides are offered during the holidays. It is a bit of a walk from the car park, so bring bicycles or buggies. There is a similar outdoor play area in Argentiere at the end of Chemin de la Moraine, but without facilities.
In Les Houches, there is a playground by Lac Chavants. You will also find a cafe, rock climbing, a tree-top adventure, and a trail that takes you around the lake, perfect for practicing the little ones cycling.