The beaches
Tenby has four beaches arranged around a headland topped by a ruined castle. What makes the town unusual is what happens when the water drops — Castle Beach, North Beach, and Harbour Beach effectively merge into one continuous stretch of golden sand, and St Catherine's Island becomes a peninsula you can walk to.
The island is a Victorian fort on a rock that spends half the day surrounded by water and half connected to the mainland. Timing that walk is exactly the kind of thing Shore Check was built for.
Planning your day
Families with kids should aim for North Beach with the tide going out. As the water drops, the sand opens up — vast, flat, perfect for running around. Rock pools appear around Goscar Rock at the northern end, and the shallow water near Castle Beach is warm enough for paddling well into September. If North Beach is heaving (and in August, it will be), walk south. South Beach stretches for a mile and a half, and after ten minutes the crowds thin to almost nothing. There's a beach shack near the car park end for ice cream and sandwiches, and deckchairs for hire if you've forgotten your own.
Dog walkers need to know the rules, because they're enforced. North Beach bans dogs entirely from May to September. Castle Beach the same. South Beach allows dogs year-round at the far southern end, beyond the marked restriction zone — look for the signs. Out of season, from October to April, all four beaches welcome dogs. The best dog walk in Tenby is the length of South Beach at low tide — miles of wet sand, the sea on one side, dunes on the other, and almost no one around.
St Catherine's Island is the thing that makes Tenby different from every other beach town. A Victorian fort sits on a rock about a hundred metres offshore from Castle Beach, and at low tide the sea drops far enough to walk across on sand. The fort is closed to the public, but the walk itself — out across the beach, around the base of the rock, with the town behind you — is worth the timing. Check Shore Check, give yourself at least an hour either side of low tide, and don't dawdle. The water comes back faster than you'd think.
If you just want quiet, walk south. Past the car park, past the last deckchair, past the beach shack. Keep going. The dunes get higher, the people get fewer, and eventually it's just you and the sea. Bring everything you need — there's nothing down there except sand.
Good to know
Tenby fills up fast in summer. The car parks near North Beach can be full by 10am on a sunny day in July or August. The multi-storey on Upper Park Road (591 spaces, EV charging) is the largest and rarely completely full. Arrive before 10 or park there and walk down.
The Pembrokeshire Coast Path passes directly through Tenby. If you're walking the path, the town is a natural lunch stop — the harbour has fish and chips, crab sandwiches, and boat trips to Caldey Island (a working monastery with a perfume shop, about twenty minutes by boat).
Tenby's pastel Georgian houses are painted in regulation heritage colours, and they look exactly as good in person as they do in photographs. The town has been pulling visitors since the Georgians started sea-bathing here in the 1780s, and it hasn't lost the knack. It gets busy — genuinely busy — in July and August. But there's always South Beach, and there's always the tide to thin the crowds for you.