Olympic Gymnasium, Hanyang University

Seoul Forest

The park is open 24 hours and never closes, but almost everything worth timing inside it does — the ecological forest, both conservatories and the floor fountain all keep separate hours, and the two indoor ones shut on Mondays. Tents, sun shelters and awnings are banned outright, which is the rule most picnic plans get wrong.

Gyeongdong Market

It closes at 18:00 and most stores are shut on Sundays, so it suits a morning visit rather than an evening one. People come here for ginseng, medicinal herbs and ingredients more than for food.

Ttukseom Hangang Park

A Hangang park on the Jayang-dong riverside, and among the simplest of them to walk into — an exit of Jayang station on Line 7 opens straight onto the park.

Dongdaemun Design Plaza

It closes three days a year and otherwise runs 10:00 to 20:00, but that figure covers the site, not what is inside it — each hall keeps its own hours according to whatever exhibition is running. Check the programme, not the building.