Having had an epic experience getting across to, and to the top of, Castle Rock it seemed a shame that there was no cache in place here. Mrs. O. managed to find enough raw materials in her magic bag of tricks to place one.
This location is remote but easily accessible by boat - even as confirmed landlubbers, we managed it on only a two hour boat hire and for 20 minutes of that we were unexpectedly stranded on a sand dune.