More adventurous travelers in search of unspoiled natural beauty and diving thrills can explore the Similan Islands in the Andaman Sea, a group of nine small islands off which lie countless dazzling coral reefs, or, southward near Malaysia, the huge Tarutao National Park, where 51 islands cover an area of nearly 1,500 square kilometers.
Across the peninsula, off the southeast coast, lies the island of Koh Samui, a more recent tourist discovery that also offers memorable beaches fringed by graceful coconut palms and a number of smaller off-shore islands.
Several southern cities such as Nakhon Si Thammarat, Chaiya, and Songkhla can look back on an ancient history, reflected in deep-seated traditions, the remains of splendid temples, and elegant old houses. Others like Hat Yai, Thailand's third largest provincial capital, have a booming modern energy fueled by the region's prosperity, attracting large numbers of Malaysian tourists with shops and entertainment facilities. In the southernmost provinces of Narathiwat, Pattani, Yala, and Satun, the domed mosque is as much a part of the landscape as the spires of a Buddhist temple, and Malay is the second language of most people.