Wuyuan is one of the most photogenic countryside destinations in China, known for white-walled villages, seasonal flowers, and a calmer rhythm than the usual city-heavy routes.
Spring is famous for rapeseed flowers, but autumn is also beautiful if you prefer gentler crowds and softer colors.
2 to 3 days works well. You can combine Wuyuan with Huangshan or Jingdezhen for a broader eastern China route.