I've already got a plan to climb Coal Hill and then walk through Beihai Park with a few friends of mine.  But we set an early time and might be finished when you're arriving at Zizhuyuan.

我已经计划好了去景山公园，然后和几个朋友一起去北海公园走走。但是我们约的时间比较早，可能等你到紫竹院我们都逛完了。