Visited 2nd August 2003: Why is everyone in such a rush to get to Barclodiad-y-Gawres? This little cairn (or tumulus depending on who you ask) is on the way, and well worth the detour (a detour of about 3 meters from the footpath). The remains of a cist are clearly visible in the middle of what's now a rather flattened mound.
NB. It's tempting to keep stepping backwards trying to get a photo of the cairn with the sea behind it, but be careful of the quarry that has been dug just to the east of the site.