Qiongshan, China

With a population of 655,553, Qiongshan is no sleepy backwater. The former center of Chinese administration on Hainan Island, it's a bustling district that retains a sizable local dialect and culture. However, don't expect an easy ride - the bureaucracy can be a persistent headache, and the irregular coastline and mangrove forests bring their own set of challenges. Overall, Qiongshan is a vibrant locale, but one that demands resilience and adaptability from newcomers.