This 4-hectare park is richly informative of the Hakka (descendents of immigrants from Guandong province) across Taiwan, though largely in the form of video and posters. The best time to visit is during a traditional event, such as the Yimin Festival (18th to 20th of the seventh lunar month).
The park connects via a very cool bike bridge to the riverside. If you are coming from Treasure Hill, head north until you see the bridge going over the dike walls.