The highlight of this area is the "Firefly Season" in April and May every year. Due to the unpolluted nearby streams, small cultivated land, and no use of pesticides in farming, the ecological environment is well-preserved. During the firefly season, groups of fireflies can be seen flying along the sides of Provincial Highway 63, with the black-winged firefly being the most common species. The area around Tannan Catholic Church is also an excellent spot for firefly watching.
Tannan, Dili, and Shuanglong are all located in the river valley, on relatively flat plateaus and terraces, surrounded by steep mountains ranging from 1,000 to 3,000 meters in elevation. As a result, there is limited arable land, and traditional Bunun people have relied on gathering, hunting, and dryland farming as their primary means of subsistence. The local agricultural products are mainly high-mountain vegetables, with Taiwanese oyster mushrooms being a staple in almost every meal. The organic vegetables, grown without pesticides, allow the natural sweetness of the ingredients to shine through.
When staying at local inns or mountain lodges, visitors can enjoy authentic Bunun cuisine, such as roasted pig, stone-grilled pork, wild game chicken, tree bean soup, steamed river fish with mountain pepper, and wood-scented mushrooms, among others. After a satisfying meal, guests can also participate in DIY activities, such as pounding millet glutinous rice cakes and sipping millet wine, to experience the traditional food and drink culture of the Bunun people.