Gaoyi Waterfall Group (中文版：高義瀑布群) is a series of small waterfalls and swimming holes in Taoyuan, Fuxing District. The first waterfall can be seen from the road (North Cross Highway) and is easy to get to. To get to the others you can either climb up from the left side of the first waterfall, or a small path through the forest from the parking area. From there, getting to the next 4 waterfalls is fairly straight forward. There are some ropes on the path, but they aren't always necessary.
There are even more waterfalls up the river, beyond these five.
Gaoyi Waterfall Group
Taoyuan City, Fuxing District
Waterfall: 24.71655, 121.34579
Parking: 24.7173, 121.34684
Detailed Map: https://goo.gl/AeB8gQ