Several miles off the shoreline of Nassau, Barry Rassin, the 2018-19 president of Rotary International, balances in the bow of the bobbing Rat Bat. There are no colossal cruise ships out here, no noisy Jet Skis, only the occasional passing pleasure boat and the sound of water lapping against the hull. In the turquoise sea below, giant turtles glide across the ocean floor. 

“To me,” Rassin says, “the sea is freedom, it’s peacefulness. When I’m out on the water, everything fades away. You feel like you’re at one with the world and nothing could go wrong.”