Isabelle Kliger is a Barcelona-based writer who covers travel. Visitors have been flocking to the Thai island of Koh Samui for more than three decades, but it is about to get even more popular.

Koh Samui is a quintessential honeymoon spot. Couples can enjoy private beachside dinners, rejuvenating spa treatments, or explore nearby islands like Koh Phangan and Ang Thong National Marine Park.

Add articles to your saved list and come back to them any time. It is the island that has as many incarnations as Beyoncé. With its lovely white beaches and its lush interior, Koh Samui, sitting ...