The book is marked

Quest Text Resting is also a part of training.
Isn't it nice to enjoy another way of life?

Summary Yes...I've only been there once.
I have marked the location so you should be able to find it.
If you find it, please come back to tell me.
I might remember more by then...

Summary Hm...You want to look for Borgo in Polly's Forest?
Like you, he was also fascinated with the nature.
A boulder shaped like a snake? I don't know much about that.
It might be on the list.