Shimenggu (Stone Dream Valley) ( 中文版： 石夢谷和情人瀑布) is a unique stone formation in Chiayi，Alishan Township (嘉義縣阿里山鄉). Lover's Gorge Waterfall (情人瀑布) is a large waterfall, with a cave behind it, downstream from Stone Dream Valley (石夢谷). The trail-head and parking area are very nice places to camp.
The Shimenggu-Lover's Gorge Waterfall loop is 8.5km long from the parking area and takes about 6 hours. The hardest part is the first 2km to the hostel (Closed as of 3/2016), of which more than 1km is steps. There is water and bathrooms at the hostel.
1.5km passed the hostel is Lover's Gorge Waterfall (情人瀑布). It's very tall, with a large cave behind it.
The remaining 2km of the loop will take you over the top of the waterfall, and across Stone Dream Valley. If you're interested in a short river trace, you can hike up Lover's gorge to the waterfall at the end. (Which I have not done yet)
Shimenggu is at the very top at 1730 meters above sea level, nearly 800 more than the parking area.
Shimenggu and Lover's Gorge Waterfall
Chiayi County, Alishan Township
Parking: 23.57523, 120.77035
Lover's Gorge Waterfall: 23.55866, 120.77902
Shimeng Valley: 23.55566, 120.77796
Detailed Map: https://goo.gl/ccDXnb