Relaxing or Scenic places to spend a night between Chengdu and Chongqing

Me and my wife will be traveling to Sichuan end of October, start of November. We'll start the trip in western Tibet visiting Kangding and Daocheng.

We'll then be Chengdu and Chongqing split over a week. However we're not really big city people and will probably feel quite overwhelmed after touring these cities.

Therefore we're trying to find a smaller, charming and relaxing town or village where we can stay 2 nights on returning from Chongqing. We love nature and hiking but will settle for just a chill atmosphere with no crowds.

We need to stay the final night in Chengdu to be in reach of the airport and would ideally want something with a train connection between both cities.

Thanks in advance, Can't wait to visit