In reply to Daniel Duerden:
If you want to go for a big Main Cliff adventure, then the classic routes up to E2, except Hypodermic are all OK I think. Scavenger is a superb HVS if you've not done it, Nightride is good but the difficulties a bit short lived (hard at E1), Res Direct good, Gogarth OK (but a bit broken and hassly, especially in a 3). I think it's the E3s that have the shit belays (and presumably the harder routes too) - Big Groove would be a laugh*!
At South Stack, NW Passage is a brilliant route with a very spacious belay. Wouldn't recommend Freebird/True Moments. I don't think I'd head down Wen Zawn in a 3 (but plenty do).
*as in gallows humour