Vacations are all about indulgence: poolside cocktails , late nights out, and a general suspension of rules and routines. And while the appeal of a weekend getaway or an international trip isn't always tied to drinking and debauchery, for a growing share of travelers, it's increasingly defined by opting out of it. Enter sober tourism ; part of a larger trend toward wellness-based travel , with more and more tourists trading in vacation hangovers for saunas, mindfulness, and experience-driven