A more difficult hike is eight kilometers long and not for those afraid of heights.

VOA: special.2009.09.28

and kind of go crazy, like go out into the wilderness and go on a really long hike

让自己疯狂，比如去荒野里，去走一段很长的远足，

艺术从自由起步 - SpeakingMax英语口语达人