After getting off the bridge, the south bank connection of Hangzhou Bay Bridge has the following exits in turn: Anton, Xinpu, Guanhaiwei, Zhang Qi, Cicheng and Qianyang. Among them, the nearest to Ningbo city is Qianyang. Also in Qianyang, this connecting line joins the expressway Interchange around Ningbo.
If it is a one-day tour, the time is actually quite tight, because it takes more than two hours to drive one way. I suggest you go to Tianyi Square in the center of Ningbo and eat seafood at Shipu Hotel in the square at noon. Go to Tianyige in changchun road in the afternoon, which is a famous place in the city.
As for the budget, it's up to you to choose. Some are cheap, some are extravagant and some are uncertain.