There is nothing at the posted location and there is no need to go there.
The central region of Anglesey has very few caches and that raised the question - where is the centre of Anglesey? There are numerous ways of defining it but this cache is placed at the intersection of lines drawn from the most northerly point (actually the tower) with the most southerly point (actually the light) with the line from the most westerly part of Holy Island (actually the light again, the one connected to Holy Island by a bridge) to the most easterly point (the light again). All four points are on the mainland of Anglesey and Holy Island, not the off islands.
The final location is about 3 m into a field and so I have kept the co-ordinates as they should be and have provided a hint for the final location if you need it.
Parking is available about 50 m from the final cache. NOTE - Most people fail to solve this by an incorrect choice of the southern most point. It is not on Llanddwyn Island!