Starting from the University, you could hire a taxi to drive you to Houhai (a part of Shichahai) with a reaonable price. Then, you could walk along the Houhai and Qianhai and then get to the north gate of the Beihai Park. Of course, you could take taxi directly to the south gate of the Beihai Park and then exit of the north gate to visit the Shichahai area. Actually, this one should be more proper!

Thank you MrHank for your information.

Humen is a small town so all the hotels are not far from the wholesale mall. There are several low cost hotels in Humen, such as Home Inn and City Inn Yunhe Humen.