New NPC in the port location will now has job for you: container delivery.
You can repeat quest as many times as you want, to collect required amount of money. Regular quests are more profitable, though. Why? We need some kind of grind before adding trade, otherwise the player might not have enough money to complete the main quest. Number of crates to deliver and target places will vary every time.
Notice, that with crate in your hands you can't use ladders, so you might need to find new path between locations.

Or, build your own pathway. For that we have movable teleports and movable springs, which will shoot you in the air.