Hello, you can take train from Guilin to Huangshan, and then take bus from Tunxi (near Huangshan) to Jiuhuashan。 By the way, did you mean Hengcun at Tonglu, Zhejiang? Since the name is a little confusing, please make it clearer.
For your stay at night, you can stay in hotels near Huangshan, go to Jiuhuashan in the morning and getting back to Huangshan at night, since Jiuhuashan and Shanghai are in different directions.

Dear Ms. Melly,
thank you very much for your prompt replay. I did a mistake while writing: I mean Hongcun ( http://en.wikipedia.org/wiki/Hongcun ) in Yixian.

This make it much clear now. :)
For your route, Huangshan and Hongcun are at the same area and Jiuhuashan is a little far away from them. You can go as Huangshan--Jiuhuashan--Huangshan--Hongcun--Huangshan--Shanghai,since there is no direct bus between Jiuhuashan and Hongcun. Maybe you can rent a car to those places since you are a lot of people~