Jamsil Students' Gymnasium

SEA LIFE COEX Aquarium

Nobody should pay the gate price. The operator's own site sells the same adult ticket at a standing discount and drops it further on selected dates, so the number to plan around is the online one, booked before you arrive.

Starfield Library

It is a mall atrium, not a library in the quiet sense — there is no lending, and the photographs everyone comes for are of a space full of people. Power sockets and worktables make it a genuinely usable stop between COEX appointments.

Jamsil Hangang Park

A 4.8 km stretch of the south bank between Jamsil Railway Bridge and Yeongdong Bridge. At the weir under the south end of Jamsil Bridge runs Jamsil Eodo, a fish ladder with a 228 m observation deck and a viewing window, so you can watch fish work their way up past the barrage. The operator describes the park's nature-study garden as a popular spot for children's field study and family picnics.

Bongeunsa Temple

The temple publishes no opening hours and no admission fee anywhere on its own site. What it does publish hours for is the bakery, the noodle canteen, the Buddhist-goods shop and the florist — which is a fair description of how the grounds are actually used.