Ciel et Cimes offers guided hiking and astronomy experiences in the Southern Alps, between the Mercantour and the Mediterranean. Led by Alix Millucci, a qualified mountain guide and astronomy educator, the activities invite participants to explore the natural world through the history of the Earth, the evolution of life and the mechanics of the sky. Many outings take place in the Alpes Azur Mercantour International Dark Sky Reserve.

The programme includes themed daytime hikes, evening walks with stargazing, and multi-day itineraries. Routes visit places such as the Authion massif, the Siagne gorges, the Millefonts lakes, the Gorges de Daluis and the Vens lakes. Selected hikes combine landscape discovery with evening observation of the starry sky. Ciel et Cimes also provides educational activities, workshops and training designed to introduce astronomy and explore subjects such as biodiversity and the origins of the solar system. Experiences are available for individuals through a partner booking site, while companies and local authorities can contact the guide directly.