In reply to goldmember:
Elidir is hard to fit in..
The classic loop is Ogwen > North Ridge Y garn >Glyders> Tryfan > south ridge > back via cwm tryfan or bochlwyd.
However you can head down the old A5 and swing up into the glyders after Foel Goch, but its steep.. and not a path then out and back to Elidir. And thats a long day.
The obvious way is just use the bus and go Nant > Elidir > Tryfan and back down the miners then cut across to pen y pass and use the bus back down the pass.