Which of you has not imagined, on a dream vacation, enjoying a nice meal, with your loved ones, feet in the sand, lulled by the sound of the waves that wash up on the reef? Now imagine a sunset over the lagoon, you may be lucky enough to see the famous green flash. You are in Reunion Island (you might have been in the cool heights, 5000 feet above sea level, a few hours earlier ...), quickly finish your punch and your tuna tartare, and dive into the clear and delicious water of the beaches of the west coast ... unless you decide to continue your digestion on a deckchair.