TIANJIN, Aug. 9 (Xinhua) -- In the mountainous areas of north China's Tianjin Municipality, hikers and cyclists are gathering to explore the natural beauty. More than 2,000 km away in Wanning, in south China's Hainan Province, paddleboarding has emerged as a popular new choice among young tourists. Even as temperatures continue to rise across much of China, consumers' enthusiasm for sports shows no signs of decli