In reply to Powderpuff:
Nothing at bryn I’m afraid. The closest bouldering is around menai bridge but they are only very minor venues
Britannia bridge boulder and the hendy boulders.
Benllech area has a good selection of problems that are fine for the solo boulderer with a couple of pads. All details are on the UKC but not in any guide book as yet.
castell mawr benllech beach and benllech.
im only suggesting these as I assume you are looking for the closest venues to where you are staying. Easy if you have transport but I’m not sure about bus services.