This city has some nice historic sites, such as the Museum of Imperial Palace of Manchu State. You could also have a visit to the Film City. More Changchun Attractions(https://www.travelchinaguide.com/attraction/jilin/changchun/) could be found on this website.

How long will you stay in that city? If time allows, you could plan a China City Packages(https://www.travelchinaguide.com/package/) to visit some nearby cities such as Beijing, Qingdao, Dalian and Harbin.