From the village Le Coin you hike to the top of Clot du Loup. Nice waterstreams, amazing views and funny marmots makes the climb to the top worth it. The top of the col is at 2660 meters. The village is at 2035 meters. When your at the top, you can find the cache. After that you can walk the same way back of make a roundtrip via pas de Chaï, which is a higher place.
The cache is a small, plastic container with room for coins of little travelbugs. It contains a logbook, so don't forget a pen or pencil. Place the cache the same way back, as it's maximum protected against the influences of nature.