Morning breaks blue over Opunohu Bay and the lagoon stirs first—glassy one moment, ribbed with trade-wind ripples the next. The jet ski idles, then lunges, and Moorea’s volcanic skyline slides by in sawtooth silhouette. Mount Rotui keeps watch between Cook’s and Opunohu bays while the water flashes from turquoise to cobalt, daring you to lean into the throttle. You skim past reef passes and over sandbars where stingrays swirl like kites in slow motion and blacktip reef sharks patrol with an indifferent glide. Guides keep a steady pace, reading the swell and the wind; you read the color changes in the lagoon, where pale means shallow and dark means coral. Expect 25–35 km of riding over three hours, with time to slip overboard for a mask-and-snorkel drift through the coral garden between Motu Tiahura and Motu Fareone.