There is great rock everywhere in that area. Alongside the great trad routes at Stone Valley Crags, for example there are tons of undeveloped boulders on perfect Gneiss. Also loads of stuff scattered around the Gruinard Bay crags (there is a tier of good rock above the first crags you come to when you drop down to the first beach from the west with parkign on the right, and stacks of potential around the lovely Opinan Slabs and Mellon Udrigle area. The BMC guide mentions some great seaside bouldering and short solos at Mellon Charles, but never explored it.