I spent this last weekend back up in Snowdonia with a couple of other people (just visible as black dots in this photo - that's right, my friends: I'd left them for dust...). We climbed Cadair Idris from the north, along a totally different route to my last trip, which meant other than the very summit, the whole thing was new to me - it's wonderful how one can experience the same mountain in two totally different ways.
Having just looked at the Wikipedia entry for Cadair Idris, I see the line:
In recent years, the Fox's Path has degraded sufficiently to make it a dangerous descent for any other than experienced hikers and scramblers
which I wish I'd seen before doing it! It wasn't as bad as some other descents I did on the Cambrian Way, but you'd certainly want a bit of confidence in your skills if you're going that way.