Niutou Hill is surrounded by sea on three sides. The peak is a big green grass of prairie, which is the best location to watch the sea, the waves and the sunset. Niutou Hill is also famous for its sunset view of Green Island. From Niutou Hill, one can see Guanyin Cave in the distance. Guanyin Cave is in the northeast corner of Green Island, about 300m off the coast. Looking from Niutou Hill toward Guanyin Cave, it looks like arches. This is why it is known as the Guanyin Cave. It is the most representative sea caves on Green Island. One can take a power boat to pass through the cave and watch the changing sea around it.