I climbed up to this circle on a beautifully squally day this October. I began at the chapel but went south first of all up an old track that wound its way up the hill through forested land and then swung back north towards the circle across several fields. One field that is two away from the circle has numerous large stones in some random scattering, together with a lovely small barrow. It was raining on and off and the rainbows were superb. The circle itself was stunning, and the views marvelous.
I went down the "proper" track, thick with hawthorn bushes at their reddest. You notice the other tracks going up as well, and the old walls sometimes lined with large flat stones. One large stone lying casually beside the track was clearly formed by hand - whether prehistoric or not it is difficult to say, but certainly suspicious.
Then on to Tyfos, where the circle is harder to access as other people have noted. But with your back to it you look straight up to Moel ty Uchaf. Wonderful day. I'll try and post some photos.
Something is not right. This message is just to keep things from messing up down the road