Parking is best at the dead end of this road with a short walk to the site.
Once at the site you will quickly find a container with various implements. The Cache itself is within 10' of this small container. Once you have found it, use any of the contents needed from the first container to construct a simple device to retreive the log. Please DO NOT REMOVE THE CACHE CONTAINER FROM ITS LOCATION. You should be able to construct a tool that will do the job of obtaining the log with little effort.
Once you have completed the task of signing and returning the log, please disassemble what you made and replace the first container.
Thanks to Therapaint for the recycled container.