Hello Hong -
The Chinese Legation was located in Avenue Hoche (the building is still there) - the park where Der Ling went for rides and where her brothers went horseback riding was the Parc Monceau -
http://en.wikipedia.org/wiki/Parc_MonceauWho wrote the play you are translating? I would love to know more about it. Please write me at
grant_menzies@yahoo.comAll best regards - Grant