Fantastic voyage: Superyachts and luxury cruise ships are delivering ultra-affluent adventurers to the ends of the earth

Nothing says bragging rights like snorkeling in coral-fringed waters off the coast of Tanzania’s Mafia Island as a constellation of whale sharks the length of standard school buses cruise by. And nothing impresses like a hike up a crater to float alongside thousands of stingless golden jellyfish in one of South Raja Ampat’s hidden marine...