From Chengdu, Panda Research Center is a must.

You can have a baby panda sit on your lap for about 100 dollars USD per 2 minutes. Yeah, its a rip off but we thought of it as a donation to the research center. My wife raves about it still to this day.

We also went to Jiuzaiguo from Chengdu but that was a short plane ride. In November, it might be pretty chilly but the scenery will still be amazing. The tourists will have thinned out by then as well.