The "Great Wall" of Southwest China---The Golden Dragon Wall, and the ancient town of Luodai.

Guilin
I think if you are looking for something which is NOT touristy you need to avoid Guilin and surrounding area. It is very beautiful but unfortunately completely geared towards tourists, Westerners and Chinese, backpackers and tour groups. I think a better option is the Guizhou and Hunan provinces. The capital cities in both (Guiyang and Chansha) see very few tourists. In Hunan you can visit the cute Phoenix (Fenghuang) town in Hunan, touristy but tourists are mainly Chinese and the neighbouring town Jishou (which I visited briefly) should be a nice place to visit, with guaranteed no tourists. In Guizhou you can travel out from Guiyang into the countryside and visit both "normal" villages, and minority villages, some of which are interesting, some are turned into spectacles. It is easy to get from Chengdu to these areas.