Buy an eSIM online or a physical prepaid SIM at an airport kiosk (fast). Pick up a T-money transit card at a convenience store and load KRW10,000–20,000 for metro/taxi use.
Major Joseon-era palace showcasing grand architecture and the changing of the guard ceremony — open typically 09:00–18:00 (often closed Tue), must-see for history and photos.
Youthful street culture, indie shops, and coffee shops; best for relaxed shopping and evening street performance energy (shops vary but many open late).
Half- to full-day guided tour to Imjingak, the Third Tunnel, Dora Observatory and Dorasan Station; ID/passport required and durations depend on tour (tours typically depart early 07:00–09:00 and return mid-afternoon).
Taejongdae cliff park offers panoramic sea views (park open 24/7, tram charges apply) — or use the time for Seomyeon shopping for clothes and nightlife.
Take a regional train or express bus from Busan to Gyeongju (~40–60 minutes); trains/buses run frequently—buy tickets day-of or book ahead for peak times.
Consider a rental car for flexibility (recommended in Jeju) or use shuttle/tours for major sites; car rentals available at airport open early to late evening.
Iconic volcanic tuff cone on the eastern coast; best for late afternoon light or sunrise the next day — open year-round (small entrance fee may apply).
If you're fit, try a short Hallasan route (Eoseungsaengak trail) — early starts are best; many trails have seasonal hours and require daylight planning.
Use remaining hours to pick up last souvenirs, cosmetics or clothing in major shopping districts; many markets open midday onward (Dongdaemun shops open late into the night).
Allow 1–1.5 hours to transfer to Incheon Airport by AREX express (~43 minutes from Seoul Station) or airport limousine bus; factor in security time for international departures.