Transportation of hemp
You may receive a message from the manger of the property, concerning the issues with hemp delivery. After you get to the place where the van with the cargo has been parked (letter P on the world map), get in and drive towards the store. Depending on how you unlocked this mission, it may turn out to be necessary to race against time (choose the shortest route possible and avoid collisions), or avoid police pursuit (drive along wilderness or along the beach until you lose the cops). Regardless of the course of the mission, park the van in a small alley at the back of the store.
Retrieving the van
You may receive a message from the manager of the estate, concerning the theft of the van with the valuable cargo inside. Your task is to stop the van, but do not exaggerate with excessive fire because destroying the van will result in failing the mission. The best idea is to use Franklin's special skill (slowing-down of time), during the ride and aim at the people in the van. Eventually, get into the van and return it to the store (it may be necessary to lose police pursuit).