how to go to Water Cube from Crowne Plaza, Wangfujing, Beijing?

You can take Subway 5 from Dengshikou Station and then transfer to Subway Line 10 at Huixinxijienankou Station, then transfer to Line 8 at Beitucheng Station and finally get off at Aolinpike Gongyuan (Olympic Park) Station and walk to Water Cube, Water Cube and Bird Nest would light on in the evening, so you'd better proceed to there at around 17:00, since you might need more than half an hour on the way.