Ever wanted to cross counties on a dirt bike and backpack full of cocaine loosely followed by the local PD? If the answer to all those is 'Yes' then this is the job for you. The organised crime in San Fierro is a deep rabbit hole, they have full control of cocaine supplies, and their main costumers are based in Los Santos. You are needed to transport bags full of cocaine to them, but watch out because the local PD isn't taking kindly to your heroic actions and they will give chase!
If you manage to damage the bag you will gradually lose the valuable cocaine, if you get shot, suck it up and move on.
If by miracle you make it to your destination, you will be awarded graciously for your troubles.