肥西县 Feixi county. A forest park with some walking tracks. There is a large Buddhist temple at the top of the mountain and multi-storey Buddhist statues carved into the side of the mountain. Best to have a driver/take a local. Stop somewhere to try 肥西老母鸡 Féixi lǎo mǔjī (famous Feixi old hen) for lunch. About 30-45 mins drive from Hefei.
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翡翠湖风景区, Fěicuì hú
Hire tandem bikes and pedal around the lake. Good place to have a picnic or read a book. Few people and quiet.
大蜀山 Dàshǔ shān
The view across Hefei is great on a clear day and there is a TV tower at the top. It can get crowded on days when the weather is nice. The walk up to the top of the mountain takes about 30 minutes. The Hefei Zoo is near but not much; it's a long walking distance along Wangjiang road.