Danyang town is surrounded by hills in various directions. There is a hill behind the town where you can actually trek up (I did not do it due to time constraint). Also across the Namhan River, you will notice that one of the hills has an observatory on top (see photo). Apparently, there is a road leading to the observatory and you can get good views of the town and surroundings from here (check with the locals for more information).
At the end of the river-side walk at the far side of Danyang town, there is a lovely park with local pavillions and various interesting statues. During autumn, this park is extremely beautiful with various colours of the autumn foliage. A must visit in Danyang especially during autumn. The "welcome bridge" of Danyang is also located here.