Sandiequan is Lushan's famous three-step waterfall, dropping about 155 metres through a steep, forested canyon. It is often treated as one of the park's essential sights, partly because the approach makes you work for the view.
The main trail descends by long stairways toward the pool below the falls, with side paths and viewpoints along the canyon. The walk back up is the hard part, so start with enough water and time, especially in warm weather.