North facing and backed by high cliffs, these beaches don't get much sun. Traeth-yr-ynys (above - pronounced 'try-thur-unn-iss') consists of sand and rocks with some small caves and is about ¼ mile long at low tide. The hill of Pen y Badell (541 feet high) is behind the beach. A steep path with some concrete steps descends to the beach from the headland, with the last few feet being a scramble down the rocks. Further along the headland another steep path descends to the shore providing low tide access to the tidal island of Ynys Lochtyn. This path is approximately 20 yards from the end of the headland on the eastern side, and can be difficult to locate if you don't know where to look.
To get here from Llangrannog, you could take the coast path, but if parking at the car park on the B4334, take the narrow lane which forks off to the right about 100 yards after crossing the stream (see map), and follow it through Lochtyn farm and onto the coast path. This avoids some of the steep climbs. Swimming is generally safe here.
Approximately ⅔ mile to the east is Traeth Glangraig (Grid Ref: SN327552), which is a small cove backed by high unstable cliffs. It consists of rocks and shingle and has some sea stacks and a waterfall which tumbles down from the top of the cliffs. Access from the coastal path is on the eastern side, and involves a steep descent down a grassy gully followed by some careful scrambling down loose scree at the bottom (a short rope would be useful here, especially in wet conditions). This beach can also be reached via a public footpath through the Urdd centre, east of Llangrannog.
The photos were taken at low tide.