Baie Ouenni is one of the sheltered coastal corners that make Île Ouen attractive for boat days. The bay gives you the classic southern-lagoon mix: pale water, reef colour, dry hills behind, and enough quiet to feel well away from Nouméa.
Snorkelling depends on the tide, wind, and where your skipper anchors. Bring reef-safe sun protection, do not stand on coral, and be ready to move if the water is cloudy or the wind shifts through the channel.