Picture this: you've booked your flight, sorted your visa, and you're utterly convinced that your forthcoming jaunt to Koh Lanta in Thailand will be a riotous affair filled with beach parties, thumping bass lines, and a social scene that rivals the rowdiest corners of Phuket or the infamous full moon parties of Koh Phangan. You've mentally prepared yourself for non-stop action, perhaps envisioning boat trips crammed with revellers and excursions that blur into one long, sun-drenched bender. But here's the rub: Koh Lanta isn't that sort of island at all. In fact, many a chap arrives expecting one thing and discovers something entirely different, often leaving them scratching their heads…