We are going to go to Shanghai Science and Technology Museum and World Expo China Pavilion from Nanjing.
Two days.
Please advise on route arrangements and accommodation (affordable).
Where to go with the extra time?
Take the high-speed train to Shanghai Station, take the No. 1 subway at People's Square, transfer to the No. 2 subway, and get off at the Shanghai Science and Technology Museum. It will take about half a day to visit.
The China Pavilion has been closed, so you can only take a look at the building's appearance when you get to Fujin.
You can go to the Saudi Pavilion to visit it.
From Shanghai Science and Technology Museum, take Metro No. 2 to Longyang Road, then transfer to Metro No. 7 and get off at Yaohua Road.
After visiting, take Line 7 and get off at Changping Road. Check-in at Home Inn Shanghai Jing'an Shaanxi Road starts at 184 yuan.
The next day you can visit Shaoxing early in the morning and return to Nanjing in the evening.