Hop in a vehicle, and get ready to race. Concentrate on the driving, rather than the shooting, and this will be easier. Do note that corner cutting is encouraged, and it's quite hard to finish the race in time if you don't. In fact you're best off trying to reach a point by way of the swallow more so than by following the actual road. If you are struggling, then concentrate on corner cutting, and remember you have that boost on L1/LB as well.
Finish this race and return in to the nearby bulletin board to finish this mission.