[2] The parish is crowned by its hill, Mynydd Eilian (177 metres), a HuMP, popular with walkers and ramblers (the Anglesey Coastal Path navigates most of the parish's coastline - all of which within the Anglesey Coastal Area of Outstanding Natural Beauty), and its beach, Traeth Eilian, which is popular with holidaymakers and for watersport activities.

At the north easternmost point is Point Lynas, (on a clear day from the north coast of Anglesey the Isle of Man is visible with the streetlights of Douglas, Isle of Man visible on the horizon), while Ynys Dulas lies off the North East coast of the island, east of Dulas Bay.The parish contains the remains of Llys Caswallon[3] and there has been a traditional association of this site with the court of 5th Century King of Gwynedd Cadwallon Lawhir ap Einion - the third generation of the dynasty of Gwynedd, being the grandson of Cunedda, the progenitor of the royal dynasty of Gwynedd.

[3] However a geophysical survey in 2009 identified foundations of a rectangular building within a trapezoidal enclosure, for which an early medieval site was a strong possibility.

[4] The Lineage of Cadwallon led to the famed reign of Rhodri the Great, who brought the kingdoms of Gwynedd, Powys and Seisyllwg under his control, and fought the threats of the Anglo Saxons and Vikings,[5] and who was killed on the island of Anglesey in 854AD.

It was this claim to this ancient Brittonic lineage by a British monarch that led to a widespread feeling of the fulfilment of the myth of the Mab Darogan, a messianic figure of Welsh legend destined to reclaim Britain for the Celtic inhabitants.

In World War I a wireless telegraphy (radio) relay station at Llaneilian was used for communication with airships patrolling the Irish Sea for German submarines.

The nave and chancel contain 15th and 16th century Flemish stained glass, which had been removed from former Roman Catholic churches taken over by Protestants, who considered the images theologically unsound.

whilst the light is retained in operational use, the building and associated lighthouse keepers cottages were returned to the Mersey Docks and Harbour Board who sold them to be a private home and holiday accommodation.