These are very enjoyable diversions. Basically, you need to use a vehicle of your choice to destroy as many targets as you can. You may think this means you want the biggest vehicle possible, but bear in mind that those targets are pedestrians, so you need something fast and large. Note also that you can fire from your vehicle to kill pedestrians and rack up additional points.
1 Star: 5 Kills
2 Stars: 25 Kills
3 Stars: 70 Kills
1 Star: 5 Kills
2 Stars: 15 Kills
3 Stars: 60 Kills
1 Star: 5 Kills
2 Stars: 25 Kills
3 Stars: 85 Kills
1 Star: 5 Kills
2 Stars: 25 Kills
3 Stars: 85 Kills
1 Star: 5 Kills
2 Stars: 15 Kills
3 Stars: 50 Kills
1 Star: 5 Kills
2 Stars: 25 Kills
3 Stars: 65 Kills
The Mojave Maw is the best in these kind of missions
I got a bulge gun