The one touristic attraction in Ningbo is Tianyi Ge. It is a garden with the oldest library in Ningbo. It is a nice quiet place within the city and it was founded 1561 by Fan Qin during the Ming dynasty.
When in the area try to go to this place. Plan in a half a day to explore the garden and just enjoy the silence of the place. Even that the place is small, it will never feel crowded because it has many corners.