If you have some time left in Hangzhou, you can visit some of its museums. I recommend two of them, the Zhejiang Museum and the Museum of Traditional Chinese Medicine.
In the Museum of Hu Qing Yu Tang Traditional Chinese Medicine Drugstore, you will find a collection of samples of medical materials, and explanations about the development of Chinese medicine and pharmaceuticals during the different Chinese Dynasties.
The Zhejiang Museum, next to West Lake, features a collection of more than 100,000 historical relics.
In Hangzhou there are also a Silk and a tea museum.