South Stack Lighthouse on its island off Holy Island — Wikimedia Commons, CC BY-SA 2.0
Go straight to South Stack while legs are fresh and light is good: Ellin’s Tower for the seabirds (April–July especially), the 400 steps and lighthouse if you have them in you, coffee at the RSPB café. Walkers upgrade the arrival: the coastal path from Breakwater Country Park past North Stack is the best two hours on Anglesey; drivers park at the reserve.
The Blue Flag beach at Trearddur Bay — Wikimedia Commons, CC BY-SA 2.0
Drop to Trearddur Bay for lunch — Sea Shanty for the institution, Inn at the Bay for the beer garden — then beach hours, or the pocket-cove alternative at Porth Dafarch. Afternoon options by appetite: the breakwater’s 1.7 flat miles, the Maritime Museum and St Cybi’s for the story, or simply more sand.
Finish on Newry Beach: dinner at the Harbourfront Bistro or the Boathouse, ferries sliding past the breakwater light. Three-hour ferry wait: country park + breakwater stroll + chips on the prom. Five hours: add a taxi to South Stack. Cruise call: your ship’s hours decide — the excursions page ranks the options honestly. However shaped, the day ends best facing the water.
No car: coastal path to South Stack out, taxi back, prom evening — flawless. With children: swap the 400 steps for Ellin’s Tower and add the country park playground. Storm day: museum, Ucheldre, long Harbourfront lunch, breakwater spray from a safe bench. The overachiever: dawn mountain summit, South Stack by ten, Trearddur lunch, Rhoscolyn headland, Dublin boat by evening — verified possible, not recommended twice.
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