Tresaith is a sandy beach flanked by high cliffs, situated just over a mile east of Aberporth. On the west side are the rocks of Carreg-y-Ddafed, and to the east the Afon Saith tumbles onto the shore in a waterfall. Penbryn beach is about a mile further east, and can be reached along the shore at low tide.
It's not the most car-friendly place to visit - there are only 5 spaces at the beach, and additional car parking at the top of the hill consists of a rough field entered by a track with an honesty box for the fee. Facilities at the beach include toilets and a cafe. Access is down a short slipway. There is a seafront pub (The Ship) which has outdoor seating overlooking the beach.
Swimming is generally safe, and sailing is also popular. Lifeguards patrol from mid-June until early September (10.00 - 18.00) and dog restrictions apply southwards from the beach access point to Carreg-y-Ddafed from 1st May to 30th September.