The main tourist district in Jeju-si is Tap-dong-lo (Tap-dong St.), which starts near Jeju port. You can enjoy a late dinner, shop the night street vendors, ride the handful of amusement park rides at Topland Amusement Park, or just walk along the boardwalk. Many bars and places in the area stay open until 4am.
Other than that, most of Jeju-si's bars are located in the "old city" near city hall. This is where the young college kids and Jeju-do's English teachers hang out.
In Seogwipo, the nightlife is centered around the luxury hotels and resorts. The Jungmun Tourist Complex has a bunch of upscale hotel lounges and karaoke bars. Also, many major hotels have casinos.
Many of Jeju-do's luxury hotels have casinos, which are open 24/7 to visitors only, so don't forget to take your passport. Hotels in Jeju-si, which have casinos, include the Hyatt, Jeju KAL, the Jeju Oriental, Crowne Plaza, and the Paradise. In Seogwipo, the Jeju Shilla and the Lotte are the only hotels with casinos.
Jeju City -- Several small pubs line the streets in the "old city" opposite Jeju's City Hall. A fun bar in the area that's friendly to women is the Bull's Darts (tel. 064/759-5559; www.dartskorea.co.kr), whose founder runs a monthly women's darts league. Games start at W500 and cocktails are W7,000. Open at 7am daily, it closes at 4am on weekdays and stays open an extra wee hour on weekends. To get to this underground bar, head down the street to the left of Holly's Coffee Shop and take the first right. Walk to the building with the flashy neon lights, and then head down the stairs on the far left of the building.
One of the few places in the country where you can get a genuinely good beer is at Modern Time (tel. 064/748-4180), a microbrew run by a German-Spaniard and his Korean nephew, which is located in ShinJeju, about a block from the Jeju Grand Hotel. It's located on the second floor -- you can't miss their large sign and stainless steel brew tanks, visible from the window. Open daily noon to 2am.
The flashiest club in Jeju-do (if not all of South Korea) is the Jeju Aroma Super Dome Nightclub (tel. 064/749-8990), a four-story extravaganza with Vegas-like performers, DJs, bands, and 100 private "booking" rooms (for those on blind dates set up by "booking" agents). Best to go with a group and get a set drink/anju (drinking snacks) menu (for example, a plate of fruit and three bottles of beer for W50,000). Open daily 7pm to 2am (the dome opens up nightly at 10:30pm and 1:30am, and one extra time on summer nights).
Seogwipo City -- Seogwipo's nightlife is mostly found in the luxury hotels in the Jungmun resort complex. One of the more relaxed is the Ollae Library Bar at the Shilla Hotel, with jazz music and an upscale atmosphere, or the lobby lounge at the Shilla, which is popular for people-watching. You can belt out a song at the J3 Karaoke Bar or have a mixed cocktail in the Island Lounge of the Hyatt Regency.
For those missing a hamburger or fish and chips, Seoul's famed Gecko's (tel. 064/739-0845; www.geckosterrace.com; 2156-3 beonji, Saekdal-dong, Seogwipo-si) now runs a location just outside the Jungmun resort complex in Seogwipo. Play a round of pool or darts while you enjoy a beer on tap. Open daily noon to 2am.
Note: This information was accurate when it was published, but can change without notice. Please be sure to confirm all rates and details directly with the companies in question before planning your trip.