But I think it could really take visitors 2 to 3 hours to walk there if they spend more time on observing and investigating historic and geological traces in Zhishan Yan. Zhishan Yan has profound historical events and insteresting natural environment, and there are clear information boards along the path. Visitors can learn a lot by taking a walk there. It is fantastic.
I took a lot of pictures of inforamtion for the plants and geological features there. My flikcr account has limit so I haven't uploaded those pictures. They include many plants' names and explaination of Zhishan Yan's geological features. I would make a special reports of plants or geology of Taiwan when I have more free time.
I can write my religious journey in Zhishan Yan, I feel it's quite interesting. In Zhishan Yan, there is a temple, Huiji Gong. I learned few things by visiting the temple.
Huiji Gong is a temple which combines Taoism and Buddhism, followers worship gods from those two religions. I think what Mingde has said is quite accuate. The temple is some kind of department store that followers only have to visit a temple and they can worship many gods and ask for many things in one stop, some kind of one-stop-shopping.
When I was checking the above picture, I found every decoration has a little statue on it, and every statue represents different characters in mythological stories. It would cost tremendous effort and be a time-consuming job if someone count how many statue in the temple and find out every statue's identity.