Solo travel is booming among Gen Z. They're trading traditional group trips for active experiences with built-in community, like a Bali surf camp. I'm not very religious. But at 11:30 a.m. on a blue-sky day in Bali, Indonesia, I sent up a prayer to the Boeing 787 roaring above my patch of waves: Singapore Airlines, please, please take me with you. My plea came as I gagged out seawater and paddl... [8972 chars]