In reply to Fauve Ferrier:
There are a few crags but you'll probably need to get a guide book to find them. Popular ones are Upper tier at tremadog (there are multi pitch climbs of every grade at the other cliffs of tremadog - craig pant I fan and bwlch y moch) Holyhead mountain on anglesey (lots of routes all grades) little tryfan worth a look, not ideal for bottom roping but lots of real easy routes and quite a friendly place.
If you are still in Canmore look up Nick Sharpe of Yamnuska Guides. He knows Snowdonia very well.
Happy to give you more info if you need it.