Tourists enjoy themselves on pleasure-boats in the Summer Resort in Chengde, north China's Hebei Province, June 12, 2013. As summer comes, tourist destinations in Chengde attracted many visitors during the three-day Dragon Boat Festival vacation from June 10 to June 12. Chengde is a city well known for its imperial summer resort of the Qing Dynasty (1644-1911). (Xinhua/Wang Xiao)