In reply to seankenny:
The tip about going via Cefn Mawr, if the traffic on the A5 is bad, is sensible. Llangollen can be busy with tourists on a summer weekend, especially when the Eisteddfod is on. But you are more likely to have trouble negotiating the narrow lanes than with congestion.
The Eglwyseg crags can catch the wind at times, but most are good for afternoon/evening sun.