In reply to Catriona:
It will be Bank Holiday busy on top, for sure...
However, try from the south via Craig Wen and Yr Aran, across the Bwlch and past Allt Maenderlyn up to the summit along the quiet S ridge. Then head east over Lliwedd andout to the "Last Nail in the Horseshoe", Gallt y Wenallt, before heading back west across rough ground into Afon Merch and back to the car via the path no-one ever uses that joins up with the Watkin. I reckon you'll see no-one until you join the Rhydd Du path, the summit will be packed, and you'll be by yourself after Y Lliwedd. Mind out for the big holes though.
b