The Hangang River in summer is already a circus. People ordering fried chicken to a GPS pin on the grass. A guy cooking ramyeon from a vending machine while his friends argue about which bridge has the best sunset. Couples on rented mats pretending they did not also bring a portable speaker.
Now Seoul is adding an inflatable.
From June 5 to 7, Ttukseom Hangang Park hosts the 3rd My Pace Hangang Festival (쉬엄쉬엄 한강 3종 축제), and the centerpiece is a floating water playground called Haechi Island, named after Seoul's official mascot, a mythical fire-eating creature who has, in 2026, been reimagined as a pink and blue blob you can fall off of in front of strangers.
Haechi Island, the festival's main water playground (AI-rendered preview image, courtesy of Seoul Mediahub)
What you can actually do
The triathlon itself sold out 30,000 spots in two weeks back in March. A small wave of cancellation tickets opens May 18 at 2 p.m. for anyone still hoping to swim, bike, and run a course they will be telling their coworkers about for the rest of the year. The rest of us, the ones who showed up to read about a festival and not run one, get the experience programs. Those opened for booking on May 14 at 2 p.m. via Naver Reservation, first come first served.
Haechi Island costs 5,000 won and runs all three days from 9 a.m. to 6 p.m. You get a giant air-bounce, slippery poles to fall off of, a floating trampoline, and log rolling, which is exactly what it sounds like and just as humbling. Bring a swimsuit and a towel. Under 10 or under 125 cm and they will, very politely, not let you in.
The wider water playground zone runs alongside Haechi Island for families
The K-content corner, which is mostly an excuse to eat
The festival has clearly read the room on what makes the Han River famous abroad. There is a chimaek session called Haechi-Maek on June 6 from 7 to 9 p.m. on the riverside stage. Chicken, beer, live music, and a Shinhan Bank delivery coupon worth 5,000 won if you show up in person. Two people for 20,000 won, four people for 30,000 won. You can do the math on which group size wins.
There is also a Hangang Ramyeon experience where you make your own version of the convenience-store noodle ritual that K-dramas have been quietly selling to the world for a decade. Free, walk-in, no booking. The Haechi mission games are the part nobody is admitting they want to do but everyone will: a cops-and-robbers chase around the park, and a puzzle hunt where you find six hidden Haechi pieces. Finish the hunt and the first 500 people get a Haechi figurine and six bottles of Ottogi low-sugar sauces, because of course they do.
If you actually want to move
The Hangang Sports Challenge is the soft sell. Climbing, ssireum (Korean wrestling), SUP, kayak, motorboat, basketball, badminton, jokgu. All free at the venue, taught by Seoul Sports Council coaches. The basketball is a proper 3-on-3 tournament with a demonstration match by the national team, and basketball plus water sports are the only categories that need advance signup on the Seoul Sports Council site. The rest, you walk up.
The Together Workout Class at the riverside stage runs daily at 5 p.m.
There is also a Dano (단오) corner at the X-Games zone. Dano is the lunar 5th of the 5th, an old Korean seasonal festival that mostly survives in textbooks, and the program brings it briefly back to life: washing your hair in iris water, throwing arrows into a pot (tuho), kicking jegi, and pounding rice cakes with a giant wooden mallet. Free, walk-in, fun in a way you cannot fake.
For visitors specifically
Two parts of the festival are deliberately built for the international crowd. The Foreigners' Hangang Crossing Swim runs June 5 from 2 to 3 p.m. at the Jamsil underwater weir, 450 spots, fins or barefoot, men's and women's divisions. The Para-Swim Competition follows on June 7 at the same spot.
The Foreigners' Hangang Crossing Swim on June 5
Honestly, even if you do not swim a kilometer of river, do not skip the festival. Bring a mat, get a chimaek box, ride the wobbly pole at Haechi Island, lose. Watch the sun set behind the Lotte World Tower. It is what Seoul does best, only there is a giant pink mascot in the water this time.
