Park on the aire de camping-cars off the route de Bonne Terrasse, pull on your sandals, and walk the short path down to the rocky headland that closes off the southern end of Pampelonne. The water here shifts from deep blue to pale green, that particular colour you only get over a sandy bottom in bright July light.
At the base of the rocks, just past the old puits Lou Pous, the path goes underwater. Literally. Eight mooring buoys mark an immersive trail, each with an information panel a metre or so below the surface, describing what's right below your fins: posidonia meadows (a flowering plant, not seaweed, as the first panel politely insists), orange wrasse, damselfish, and the serranus scriba with its improbable calligraphy of blue and red markings around the gills.
The average depth sits around two metres. No diving certificate required. A mask is mandatory; fins and a shorty wetsuit are strongly recommended but not obligatory. The trail runs through the Corniche varoise marine protected area and is part of the underwater trail network developed by the Communauté de communes du golfe de Saint-Tropez. On Wednesday mornings in season, a certified guide leads the group; the rest of the week, you're on your own.
A few practical notes: the parking is paid, there's no shade on the approach rocks, and the trail is open from mid-June to mid-September. After the snorkel, follow the path a little further to Bonne Terrasse, a quiet cove with old fishermen's houses, before heading back up to the car.
