This is beautiful walking country with clear, clean air, dark pine forests, gleaming glaciers and soaring rocky peaks. Lightweight boots and shorts are sufficient.
Waterproofs are essential and trekking poles useful.
Don't forget sunglasses and skin and lip protection. Always carry drinking water and check the weather forecast. Beware of patches of old snow, especially early in the season. In the Aiguilles Rouges, around Le Tour or in the shadow of the Chamonix Aiguilles. Explore the forests in the valleys or trek higher through alpine pastures or in the rocky mountains.