For Wuhan, I could see either doing more time there as a smaller city that's less touristed and has stuff to see or totally skipping it. One day seems pointless. If you do decide to visit, there's an archaeology museum with very famous bells, the university campus and lake, a museum of modern Chinese art, the "Bund" (including historic buildings, kite flying, and group dancing/exercise routines), some temples, the yellow swallow (?) tower, and a bunch of historic places for the communist party, including the area near the opera house. The town is divided into three areas, with their own "downtowns" and transportation. Traffic can be tough, especially between the three towns and across the river, but taxis and other stuff is noticeably cheaper then Shanghai. Don't miss the historic train station buildings.