Jeju

Yes — Jeju is fundamentally different from Seoul and Busan in character and landscape. If your Korea trip is 8+ days, 3–4 nights in Jeju dramatically expands what you experience: volcanic geology, haenyeo culture, the Olle coastal trail, and a local identity distinct from the mainland. Under 7 days total in Korea, you likely won't have time without sacrificing Seoul depth.

Domestic flights from Seoul (Gimpo Airport to Jeju Airport, Jeju Air / Korean Air / Asiana): 55 minutes, ₩30,000–100,000 depending on season and advance booking. Busan to Jeju: 45 minutes flight. The Seoul–Jeju route is the world's busiest air route by number of flights — book in advance for holidays. There is no bridge; ferry from Mokpo (6 hours) or Wando is an alternative for those who want the slow approach.

Almost certainly yes. The island's major sights (Hallasan trailheads, Seongsan, Manjanggul, Olle route access points) are spread around a 1,847 km² island. Buses exist but run infrequently to rural areas. Without a car, you'll spend significant time waiting. International driving permits are required for foreign visitors — your home license is not sufficient. Rental at the airport from major companies (KT Rental, JEJU RENT A CAR) from ₩60,000/day.

A 437-km network of 26 walking routes around and across Jeju Island, developed from 2007. Each route takes 4–8 hours and connects villages, coastal paths, volcanic formations, and agricultural land. The routes are marked by orange and blue arrows and ribbons (orange = forward direction, blue = reverse). An Olle passport booklet (₩3,000 at the Jeju Olle Tourist Center) has stamp points at each route's start, middle, and end. Route 1 near Seongsan is the most popular; Routes 7 and 10 have the most varied scenery.

Clear weather in spring (April–June) or autumn (September–October). The summit crater is accessible via the Seongpanak (9.6 km each way) and Gwaneumsa (8.7 km each way) trails only. The summit access gate closes at noon on weekdays (1 PM on weekends) to ensure descent by dark — start by 6–7 AM for a summit attempt. Cloud cover is extremely frequent; if the forecast shows cloud above 1,500m, consider the Eorimok or Yeongsil trails (shorter, lower, always beautiful). Hallasan is free entry.

Jeju's traditional female free-divers — women who dive to 10–20 meters without equipment to harvest sea urchin, abalone, conch, and octopus from the ocean floor. The practice has existed for over 1,500 years; historically only women dove in Jeju (theories vary: male divers found the water too cold, women's body composition was advantageous for cold-water diving, or social-economic reasons). The tradition is UNESCO Intangible Cultural Heritage. Today about 3,500 haenyeo remain, mostly elderly. Watch them surface near the Seongsan coast or Udo Island.

Seongsan Ilchulbong ('Sunrise Peak') is a 180-meter tuff cone — formed 5,000 years ago when a volcanic eruption occurred underwater near the coast, producing a wide shallow crater rather than the classic cone shape. The 1-km stone staircase to the rim takes 20–30 minutes. The crater (99 meters wide, 90 meters deep) at the top has a flat grassland base used as a natural arena. ₩2,000 entry. The sunrise experience requires arriving 30–40 minutes before dawn. For non-sunrise visits, late afternoon has good light and thinner crowds.

Part of the Geomunoreum Lava Tube System — a UNESCO World Natural Heritage complex of lava tubes formed 300,000–100,000 years ago. Manjanggul is 7.4 km long, one of the world's longest lava tubes, with 1 km accessible to visitors. Inside: 11°C year-round, lava stalactites (formed by dripping lava), lava benches, and at the far end, a 7.6-meter stone column formed by dripping lava. ₩4,000 entry; wear a layer as it's significantly colder inside than outside even in summer.

Depends on what you want. Hyeopjae Beach (west coast) has the most vivid teal-colored water against white sand — the color contrast with black volcanic rock is strongest here. Jungmun Saekdal Beach is the longest and has the strongest surf (Korean surfers' favorite, not family-swimming appropriate). Hamdeok Beach (north coast, near Seongsan) is the most family-friendly with calm water. Iho Tewoo Beach near Jeju City is walkable from the city. Jeju black sand volcanic beaches (Hamnyeok, Hwasun) are distinctive but not swimming beaches.

Jeju Black Pig (Jeju heukdwaeji) is a heritage breed descended from the wild boars originally found on the island — smaller, darker, and with a more intensely flavored meat than the white pig breeds raised in mainland Korea. The local claim is that the fat layer has a different texture (meltier) and the meat has a deeper savory character. Served as samgyeopsal (three-layer belly) at dedicated restaurants; the Dongmun Market area in Jeju City and the restaurant strips in Seogwipo are the best hunting grounds.

A small island off Jeju's eastern tip (15-minute ferry from Seongsanpo). Famous for: peanut ice cream (the island grows peanuts intensively and the soft-serve is a local speciality), sea urchin raw and in bibimbap (Udo's haenyeo harvest the best sea urchin in Jeju), and the brilliant turquoise water at Seobin Baeksa Beach — white coral sand rather than the volcanic black sand elsewhere on Jeju. Rent a scooter at the ferry dock to circle the island in 90 minutes.

Jeju's canola (rapeseed, 유채) fields turn vivid yellow from late February through April — the blooming period varies by location (coastal fields bloom first, highland fields last). The combination of yellow flowers, black basalt-stone walls, and turquoise sea is one of Korea's most distinctive seasonal landscapes. Seopjikoji headland near Seongsan is the most photographed location. The blooming window is often just 2–3 weeks; follow local weather reports in March for timing.

The oldest and largest traditional market in Jeju — a covered market with seafood, Jeju tangerines, black pork, haenyeo-harvested shellfish, traditional rice cakes (tteok), and local souvenirs. The indoor and outdoor sections together cover several blocks. Best in the morning (8–11 AM) when the seafood is freshest and the market is at full activity. The outdoor seafood stalls sell haenyeo-harvested sea urchin and abalone directly from the women who dived for them.

Very good. The Teddy Bear Museum, Loveland (adults-only), and the various 'theme museums' are marketed primarily at Korean domestic tourists but engage children. More genuinely: Hallim Park (a botanical garden with caves, botanical diversity, and open space), Hyeopjae Beach (calm water), Manjanggul Lava Tube (cave awe), and Seongsan Ilchulbong (the climb is achievable for children over 6). A rental car is especially important for families with young children.

Jeju is primarily a domestic Korean vacation destination — the vast majority of its 15+ million annual visitors are Korean. International visitors (primarily from China, Japan, and Southeast Asia) have grown but remain a minority. This means the tourist infrastructure is well-developed but primarily Korean-language-oriented. Outside hotels and the Seongsan area, very few restaurants have English menus. A translation app is essential for navigating the local restaurant scene.

For Hallasan: proper hiking boots (the summit trail is rocky and can be icy in spring and autumn), warm layer (summit temperature can be 15–20°C colder than the coast), rain gear (weather changes fast), and enough food and water for 7–8 hours. The trailhead stores sell basic supplies but gear should be packed from your accommodation. For Olle walking: lightweight trail shoes are fine, a windbreaker, sun protection, and water. Many Olle stages have no shade for extended sections.

July and August are the worst months — school holiday peak season, all beaches and hotels fully booked, Hallasan trails crowded, and temperatures hot and humid. The typhoon season (August–September) occasionally brings severe disruptions. February is the quietest and cheapest month but cold, foggy, and with limited visibility for the landscapes. Avoid Chinese New Year and Chuseok (Korean Thanksgiving, typically September) when the island's accommodation is fully booked.