Marcie,
Marc and I are only overnighting there, as Marc will have been off work quite a while by then so we'll have to get back.
It sounds like you have about covered Beijing, but if you want a recommendation, and if you have time you should go Chengdo (I know the spelling is not right... am spelling it like it is pronounced). We went to see the Pandas and this city was the highlight of our 3 weeks in China. They also have a "theater-like" show that is the best we had ever seen. We didn't want to go thinking it was too touristy, but the tour guide insisted and it was FANTASTIC. We used the travel company Ngaire suggeted and they were great.