This is a very unique activity that you should try in Taiwan! It's a tunnel but water-based that passes through saltwater mangroves in Taijiang National Park. The locals dubbed it as the "Little Amazon River," it offers a scenic boat tour under a canopy of branches, providing a glimpse of wildlife like egrets and mudskippers. While the tunnel itself is the main attraction, visitors can also explore the surrounding area, including the impressive Luerhmen Matsu Temple. Despite potential wait times for boat tours, Sicao Green Tunnel is a worthwhile addition to any Tainan itinerary for nature lovers and those seeking a peaceful escape.