Finally made it up to see the "Rolling Sun" at Boheh Stone. It is a very interesting expierence. Talking to a local lady that had seen it everytime in the last 36 years she said that this instance was the brightest she can remember. I would recommend bringing some kind of tinted "welders" goggles with you so that you can observe it better. I think I am still seeing sun-spots after it.
The stone is on the Clew Bay Arch trail as Site 2 and can be found by following the signs for Croagh Patrick coming out of Westport and then following the sign for Site 2.
There is a lot of construction going on close to the stone (which is in someones backyard but access is allowed!) and another spot where it is possible to view the "rolling sun" from the road will be gone as another bungalow is built up in front of it.
It happens twice a year on the 18th April and August 24th. However the locals that were there last night agreed that today the 19th April would probably be better so it looks as if it could be slightly either side of this.