You would have to enable the logging of system messages first in your Chat options, because they can start to contain a lot of junk, especially if you are crafting or fighting. So I'd recommend to enable it not before starting your walk, and to disable it right after.
It will be in the same location as your chat log. Which depends on the operating system you are using. Under Windows, it is usually: "%APPDATA%\PlaneShift\logs" (you can type that in the Explorer's address line).