How to get yuyuantan park from city inn happy valley hotel, beijing? And How far is it?

Well, you are suggested to take subway line 7, and arrive at West Railway Station. Then transfer to line 9 to Baiduizi Station, Exit D. It takes around 45 mins on the way. And the ticket fare is CNY 5 per adult. Then walk southwest along South Fucheng Road 2nd Street around 0.7 miles.
The distance from your hotel to the destination is about 18 miles.