For this new Dragon Ball Z Kakarot side story, you'll have to find a gem and bring it back to some tourists so that they can leave the planet Namek in peace. You'll see, once again, it's quite simple.
Tourists in trouble
These two people from another planet need to retrieve maristone, a precious stone that tourists covet. The search area indicated is quite large, however you should have no trouble retrieving the stone. You just have to go north until you reach the edge of a river.
If you get high enough, you will see a circle of earth: the object of our search is within this small area. Land, retrieve the object and the case is in the bag. This quest doesn't give you any extra emblem.