The weather will be cold in Shanghai and Suzhou, and its wet, but it could be warmer in Guilin and Yangshuo, you can wear sweaters and jacket in Shanghai, it you fear the cold, you can wear down coat. You can dress less in Guilin and Yangshuo. In Guilin, you can take a cruise on Li River, there are caves around this area, you can also visit Elephant Trunk Mountain, and there are several ancient towns near Guilin. In Shanghai, you can go to City God Temple, Yuyuan Garden, the Bund, Oriental Pearl TV Tower, Happy Valley, etc. In Suzhou, you can go to the traditional gardens, and visit Taihu Lake.