Hiking up Huashan from 玉泉院. The hike takes about 7h and it's fairly challenging. The food and water sold along the way also increase in prices along the way.
The path is pretty steep near the top, which is both challenging and memorable. The view at the North Peak is pretty amazing, and the path from North to the other peaks are breathtaking as well.
Huashan is a very beautiful mountain with unique smooth yellow stone formation.