12 Emerging Southeast Asian Islands That Belong on Your Must-Explore List

11. Koh Adang, Thailand

Looking for the next hot spot before the crowds arrive? Koh Adang sits in the shadow of bustling Koh Lipe but offers a totally different pace. As part of Tarutao National Marine Park, Koh Adang is a base for rainforest hikes, black sand beaches, and camping under a canopy of stars. Visitors trek to the island’s viewpoint for sweeping panoramas, or cool off in hidden waterfalls and sheltered lagoons. Local rangers manage a small set of eco-accommodations and campsites, ensuring tourism remains sustainable. Coral reefs attract snorkelers, while nature lovers can spot hornbills and monitor lizards among the dense foliage. Access is typically via boat from Pak Bara or as a short hop from Koh Lipe. November through April means dry days and brilliant blue water. For US and Canadian adventurers, Koh Adang stands out as a quieter, more exploratory option—without sacrificing the wild beauty that makes Thailand’s southern islands so compelling.