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Startin Point Four Mile Bridge or Trearddur Bay an Finishes at the same point.
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Grade from Four Mile Bridge estuary and along the wooden board walk next to the salt marshes with an abundance of birdlife. On through the fields and woodlands and onto a well defined path that takes us through a delightful pine plantation on the approach to Silver Bay, with its powdery white sands and view over to Rhosneigr and Snowdonia (through the height of the season a beach bar/ cafe is open).
We now take the designated coastal path that takes us on to Rhoscolyn with its blue flag awarded bay with an abundance of rock pools and safe bathing. Rhoscolyn Bay has views to Ynys Traws Island and the Beacon rocks, with an old beacon on the highest rock. The sea here is renowned for fishing for Pollock, Sea- Bass, Whiting and Dog Fish and diving in the crystal clear waters.
After a walk along the bay with its soft sands and rock pools, we ascend through carpeted squill and thrift bounded a mile long uniform stone wall on the landward side and cliff edges on the left. On ward to the National Coastguard Institution building with its panoramic view and which is run by 30 volunteers every day of the year. This breath taking view of the beaches of Holy Island stand out like gems among the rising cliffs.
Further on our walk to the dramatic and natural two arches. Bwa Gwyn which is the white Holyhead quartzite rock with shows massive fractures and deep weathering from the sea and 200 metres further the Bwa Du which is the black arch adjacent to a sea cave. This area is an attraction for the wild birds that include Chough, Peregrine, Falcon, Shag, Raven and Kestrel.
On the grassy descent is the view of Trearddur Bay welcoming us with its wide sandy bay, pretty white houses and quaint shops and cafe’s.
On from Trearddur Bay by the safe house filmedin the BBC production and furter beyond hidden coves vefore reaching
Porth Dafarch to South Stack
walk – moderate
Porth Dafarch belongs to the National Trust and is a Blue Flag sheltered sandy beach on the south coast of Holy Island. The area is popular with scuba diving with the 1886 wreck of the steamer ‘Missouri’ situated half a mile offshore. Anglesey coastal path cuts through Porth Dafarch beach on the final section.
As we walk north to South Stack, the path weaves in and out along the headland which in Spring  and  Autumn are covered in a mass of purple heather and yellow gorse. On the cliff top path we pass Porth Ruffydd cove known locally as the range with its deep chasm where a Roman fort had once stood, along a field to Porth Y Gwin which is a part of South Stack RSPB nature reserve.
At Ellins Tower a Victorian summerhouse which belonged to the family of the Penrhos estate and is now a RSPB lookout across the cliffs to the sea and down to the lighthouse. It is a vital breeding ground for up to 8000 birds from guillemots, razorbills to puffins and is also an attracted area for porpoises, grey seals, Risso’s dolphins and Bottlenose Dolphins.
South Stack lighthouse built 1809 is situated on an island known as sea stack because of the formation of the rocks and is accessed by 400 steps and a suspension bridge. (Open Spring and Summer ).
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