Security guards make suggestions to tourists about proper behavior during a patrol of West Lake in Hangzhou city, the capital of East China's Zhejiang province, July 26, 2016. The city has boosted security ahead of the G20 Summit meeting in September. The well-armed guards, all new graduates this year, walk 15 kilometers a day along the lake, a famous tourist attraction in China, despite temperatures that can rise to 40 degrees centigrade.