You begin the long arduous climb up the wooden gangplank.

[Ilyan Cloud, Gangplank]
A moment of vertigo hits you as you step onto the gangplank, and the realization hits you that you are about to board a huge ship that is actually floating in mid-air. Carried on the wind are the voices of sailors on board as they go about their duties, as well as the voices of the travelling merchants hawking their wares.
Obvious paths: up, down.