19. Koh Phi Phi Leh – Thailand

Famous for its appearance in the movie “The Beach,” Koh Phi Phi Leh is every bit as magical as you’d hope. Dramatic limestone cliffs rise from sparkling turquoise waters, creating a stunning backdrop. Though it draws crowds, visiting early in the morning or via private boat keeps the experience intimate. Snorkeling here reveals vibrant marine life just beneath the surface. It's a must-see for beach lovers wanting postcard-worthy views and dreamy water clarity.