Penmaen Head is ideal for those grades. The GF may be a bit nervous on first acquaintance as it does look like shit but it's generally solid and climbs much better than it looks, although the new A55 guide overdoes the stars by one. It gets the sun after lunch.
Castle Inn has a couple of good routes in the low 6's and a few 6c's, gets lots of sun.
Llandulas Cave probably not good for the gf (no worthwhile low 6's), and only has a couple of good mid to high 6's and a few good 7's.
LPT has the 4 routes at the far end all 5+ - 6a+. Lots of people leading 6's find it quite hard on first acquaintance (don't know if you've already been there).
Pen Trwyn has one 5 and only a few easier 6's, prob not the best venue for gf but loads of good high 6's (many of which feel nails on the O/S). There's a nice new set of photo topos to the whole of Pen Trwyn on the north wales limestone wiki
Lower Empire is good for higher 6's roof climbing, good suntrap and out of wind, and just been re-equipped.
The Gallery is good for evenings or heat waves, but again nothing below 6b I think, and the rock is intimidating - lots of sharp edges but quite good climbing once you get over the fear of slicing your rope in half!
