Cruise traveling stopping in Hong Kong (1.5 days) and Tianjing/Beijing (2.5 days)

We hold Mexican passports(living and working in the US) will be cruising from Singapore to Tianjin. During the this trip we will stop in Hong Kong for 1.5 days and then the cruise will end in Tianjin where we will take a tour to Beinjing and spend 2 days there. What kind of tourist visa do we need? (? Entries) Thank in advance for your information.