There are many historic building (Bao Garden, etc) around the waterfront. In addition, don't forget to visit the Sanhe Historic Town in the south of Hefei, good to go for 4-6 hours.
However, the air is so dirty that it is hard to see a mountain in about 250m far away. The dust is too serious and make the whole city grey.
Hefei have Good people , they are welcome Foreigners they good good food and good shopping in city canter