"빨리 등산합시다."

Translation: Let's climb a mountain quickly.

[Lizardosity]

'Let's climb quickly' should also probably be an accepted response

[Ash-Fred]

"Let's climb quickly." is now accepted. However, please keep in mind that 등산하다 is to climb a mountain, not just anything.

[ThomasPrik]

so why is often "hike" the expected answer?

[RickyVeils]

can this mean let's go hiking soon? because let's go climbing quickly just sounds weird

[JONGHWANKI5]

Let's climb quickly ok
Cuz climb is a verb

[Dawn190589]

Your answer incorrectly required a space after the ' and before the s

[ZoeZozyNel]

whats wrong with "lets quickly go climbing"?