Puerto Princesa’s claim to fame goes way beyond its swanky beach resorts and dolphin-watching cruises. The UNESCO-listed Underground River wows visitors with its low-hanging stalagmites and stalactites, and a cave that—due to its sheer size and rock formations resembling religious figures—is likened to a cathedral.

The dive sites surrounding Ko Lanta are considered to be some of Thailand’s finest. An intricate system of reefs, islets, and underwater caves are teeming with vibrant sea life. While you splash in the waves you may catch a glimpse of a Moken (sea gypsy) boat, gliding nomadically through the waters. Cap off your day with mouthwatering seafood, freshly caught and spicy enough to make your tongue tingle.