4 days small circle tour
Chengdu - Wolong - Danba -Tagong - Kangding - Ya'an panda center - Chengdu
Day01: Chengdu to Rilong (260KM) 
leave Chengdu early around 07:00 for Rilong. on the way there, going passing Dujiangyan water project, Wolong Panda center, driving over Mt. Balangshan, and reach Rilong at around 12:30; in the rest of the day, you can hike in Haizi valley.
if you want to trek in other valley in Rilong, please read suggestion below
Day02: Rilong to Danba (125KM)
In the morning, choose to tour Changpinggou valley or Shuangqiaogou valley; spend several hours inside for sightseeing
after here, leave Changpinggou or Shuangqiaogou valley at around 15:00 for Danba, on the way there, go to Zhonglu to see remained 'Gudiao',which looks like a narrowed-up tower with 4 to 8 faces; and go to Suopo villiage, and enjoy the grand view of the remains of Suopo 'Gudiao' from this side of Dadu river; remains of Suopo 'Gudiao' are to the other side of Dadu river. stay overnight at Jiaju village, which is on mountain slope almost to the top.
(at Zhonglu village, there is only one guesthouse, therefore, if it is possible, you can stay overnight at Zhonglu village, and go to Jiaju next morning; then, you get enough time to stroll in this beautiful and peaceful mountain village for photo shootings),
Day03: Danba to Tagong to Kangding (230KM) 
leave Jiaju village after breakfast for Kangding through Bamei and Tagong; at Bamei, visit to Huiyuan monastery; and in Tagong, visit local Tagong monastery and enjoy your time there or on the extending grassland; in late afternoon, get to Kangding; you are free to walk around in this small city.
Day04: Kangding to Ya'an panda center and back to Chengdu (395KM)
leave Kangding after breakfast for Chengdu; on the way, you will go through Mt. Erlangshan tunnel, and do de tour visit to Panda bears in Bifengxia natural reserve. (if you do not like going to panda base, you can skip over, and go back to Chengdu directly)
NOTES:
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if you want to do trekking in one of the three beatiful valleys at Mt. Siguniangs (located in Rilong), you need to put one more day onto the suggested priogram (see above)
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the three valleys in Mt. Siguniangs are respectively A. Haizigou valley B. Changping valley and C. Shuangqiao valley