A fast-moving Caribbean storm chased us off the idyllic, mostly empty Cuban beach. The wind almost whipped the towel out of my hand as I pushed the key card into the door of our third floor hotel room. Nothing happened. Tried again. Nothing. By the time my companion returned with a new card — and news of a power outage — rain was coming down in sheets. Though we escaped the tropical deluge, our neighbor’s room flooded in the all-inclusive, government-owned resort near Trinidad. When...