NORTH EASY DAYJeju City on foot and short buses
Use Dongmun Market, the old center, a coastal stop and the airport corridor when arrival is late, weather is unstable or the next flight is early.
Lowest transfer riskEAST DAYDaecheon loop or Seongsan — not both by default
Choose the 810 volcanic-interior loop when its live timetable fits, or use a direct east anchor around Seongsan and a nearby coast. Combining both can strand the useful middle.
One eastern systemSOUTH DAYSeogwipo city makes a complete fallback
Lee Jung-seop Street, a city waterfall, Jaguri coast, market and a selected Olle segment can survive mountain wind or a missed rural bus without crossing the island.
Walkable cluster + city busesWEST DAYThe 820 loop is not the west coast
Use Donggwang's 820 for its current museum and inland stops. Hyeopjae and Aewol belong to a different coastal-bus decision and should not be added because both are west on a map.
Separate inland and shoreline plans