According to Cambria Archaeology Carn Llidi Bychan is a prehistoric boundary wall, so there may not be much to see on the ground.
We walked relatively close to this site on our way between Coetan Arthur and the Carn Llidi chambers, but there’s loads of gorse covering the area. If it hadn’t been blowing a gale I might have tried pursuading Lou to explore further, but I knew not to push my luck.