It is in town, which makes it the thing to do between trains. It is not a substitute for the downstream landscape. If you only have one Guilin hour, this is the hour. If you have a day, go to Yangshuo.
Guilin · 象鼻山
Elephant Trunk Hill
It is a short climb and a famous silhouette. See it from the water if you can, and from the path if you want the half hour inside the gate.