Kefalonia is the favourite holiday destination for Team RoKeT. The location of the cache is a particularly favourite spot, which we wanted to share with others but which we wanted to make slightly more "interesting".
Park at Skala harbour (take a right turn immediately after Apollo appts when travelling along the road from Skala to Poros).
From there walk (or swim if you are really brave) round the corner. The rocks offer some interesting shapes but are rather sharp so some footwear is required. Look out for sealife in the rock pools as you pass.
There is a point after which progress nearer to the cache is almost impossible and which provides a nice flat platform from which to jump/dive into the sea (see pic). It is then a short swim to the cave.
The cache is obvious so your GPS is not really essential in the cave (and anyway it probably wont work!)
A torch is not essential but may help.
Small note on cache maintenance: There is a local cache guardian. Name and contact info on file with geocaching.com.