Shuangsi Viviparous Tropical Forest Tropical is located near the famous Yellow Butterfly Valley. Expanding into an area of around 7 hectares, the Forest was originally a specimen forest for the forestry research institute established in 1935 during the Japanese Colonial Period. This Forest features tropical plants and the lush greens created a serene environment for recreational purpose. It is open for public use with simple BBQ, camping, and exercise facilities. Like Xitou, it is great place for a delightful forest SPA.