Koh Lanta is an island of dreams, and hideaway on a peninsula facing the sunset is unbeatable for raw beauty, seclusion and romance. Splurge on a pool villa for two perched on a cliff. Wander down to private stretch of beach for afternoon reggae and rum cocktails. Island living also means ocean time, with all-day sunbathe, visits to emerald caves, and some of the best diving in Thailand.