Destroy cargo in Port was a mission in Jak II. After catching the scouts in Haven Forest, Jak received a call from Krew, who heard from his racing client that Jak was pretty good with that JET-Board of hers. A shipment of Krimzon Guard listening equipment had arrived in the Port and he needed Jak to get rid of it (both for him as well as the Underground).
Walkthrough[]
Map of the targets
Once you arrive at the port, you'll see a large number of green blips, signifying the cargo that needs to be destroyed. Each cargo is surrounded by mines that explode shortly after being touched or when something gets too close. There is a timer of 2:15 minutes, which starts as soon as you hit one of the cargo (there's 16 total).
The image here can be used as one possible guide on which course to take to destroy all the cargo, although a quick survey with a zoomer can make it easy to see the layout yourself. You'll need to use the jet board to move around and hit the cargo while avoiding the mine. You can use tricks or jumps to go faster or avoid mines as well. When a mine explodes in Jak's proximity, it takes out two sections of his health. Also note that shortly after hitting the first cargo, the KG goes on alert, which is hardly an obstacle here, considering you are on the water for pretty much the entirety of the mission.
It is possible to use a KG patrol bike or cruiser and just shoot down the cargo and mines from a distance with the mounted gun. Also note that once the mission is assigned, the doors to the Hip Hog Heaven Saloon and gun course will both remain closed until the mission is completed.