This fourth one in the series can be located on foot along the coastal path from #3.
Alternatively if approaching by road, there is a waypoint for a car park attached to the nearby Taverna.
The path actually goes through the taverna's garden, however the cache is located outside it's boundary.
Watch out for fishermen on the rocks, onlookers in the Taverna garden, also a tent set up close by where you can have a massage if you have time.
Update...3/5/21....this is now a small camouflaged pot containing only a log sheet, so please bring your own pen.