우도 · Nature · Jeju
Fifteen minutes by ferry from Seongsan. Rent an electric bike at the pier; the loop is 17 km and the coral-sand beach is on the west side.
Check how busy it is right now →Live crowd levels for Seoul, 14-day forecast elsewhere. No sign-up.
There is no weekly closing day here — you can come any day of the week.
Counting foreign visitors to Jeju City over twelve weeks, Thursday is the quietest day you can actually go and Tuesday the busiest — a difference of about 6%. These are district-wide figures rather than a headcount at the gate, so treat them as a tendency.
This is an open area rather than a ticketed site, so there are no opening hours to work around. Early morning and late evening are the quietest.
Entry is free. Ferry from Seongsan ~₩10,500 return; rental cars are not allowed on the island Nothing needs to be booked or queued for in advance.
Cards are accepted. Foreign Visa and Mastercard work almost everywhere in Korea, and contactless is normal.
English signage is partial — enough to find your way, not enough to explain what you are looking at. The Korean name above is worth showing to a taxi driver or a passer-by; it works better than pronouncing it.
There is no subway station close by. A taxi or an intercity bus is usually the way in — show the Korean name above to the driver.
Google Maps · Naver Map · Kakao Map
Google Maps shows public transport in Korea but not walking routes. Naver or Kakao Map gives walking directions.