Hanilkwan Apgujeong

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.

Seonjeongneung Royal Tombs

It sells monthly and lunchtime passes, which tells you what it mostly is: a working park that office workers and neighbours walk through, which happens to contain two royal tombs. Under-25s get in free, so for most young travellers the ticket price is irrelevant.

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.

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.