Seongsan Ilchulbong Tuff Cone

Seopjikoji

A headland running out into the sea on Jeju's eastern coast. Koji is the Jeju word for a cape; for Seopji the publisher records two readings side by side — that it describes ground said to produce men of talent, and that it comes from hyeopji, meaning narrow land. The path crosses hills of red volcanic scoria and follows low rock cliffs, and a Joseon-period beacon mound stands on the open grassland. What sets it apart from Jeju's other coastal walks is that Seongsan Ilchulbong stands in the background for most of the way round, which is why it photographs the way it does.

Udo Island

The ferry controls the whole day: photo ID is a legal requirement to board, not a formality, and outside vehicles are barred from the island until 31 July 2029 apart from named exceptions. Plan around the last sailing back, and note the island charges its own park admission on top of the fare.

Bijarim Forest

Two loops split at a crossroads inside the wood. Course A is about 2.2 km of level volcanic-cinder path, 40 minutes to an hour, and takes a pushchair or wheelchair with help on the slopes; course B includes rough stone and does not. Dogs are not admitted, which separates this from most Jeju walks.

Secret Forest

A walk through cedar west of Andol Oreum, with tickets sold from a mint-coloured truck at the entrance. The unpaved loop takes about half an hour and has eight marked spots to photograph, with a stand of hinoki cypress partway round. Closures are posted on the operator's Instagram rather than following a fixed calendar, which is worth checking before driving out here.