This is the game's only story mode race - the only thing you need to worry about is the second last checkpoint where crashing through a barrier could put you in the riverbed. Otherwise, just take the corners steady - you'll have plenty of time to outdistance the other racers on the straights.
Escuela Of The Streets
This is the first mission where you really need to tail someone. Watch out at the traffic lights and on corners, because it's easy to accidentally get too close and scare your targets off early. When you get to your destination, shoot everyone. You can either shoot the lock off the door - which'll warn them that you're coming in - or throw a brick through the window, climb in that way and take them by surprise. There's a Sprunk machine at the back of the warehouse to top up your health when you're done.
Here you need the element of surprise to get all your targets. Kill the first two gang members by ramming your car into them, jump out to finish stragglers then get the other car. There are cops everywhere, but if you start a gunfight there's a chance they'll actually do your job for you.
The Puerto Rican Connection
Here you're following an elevated train. Just switch to the far view with select and look out for corners by watching the radar. When it stops, pop the two goons then sprint after the guy. You can shoot him at a distance if you use the lockon, but try to do him in one shot to minimise police interference.
Luck of the Irish
A relatively simple introduction to sniping, this. The only tricky bits are that you'll need to shoot the guy struggling with Packie on the left, and the last guy through the window of his truck.
Blow Your Cover
Don't pull a gun until you're up the first flight of stairs in this mission - even though the people downstairs threaten you, you don't actually need to take them on. On the way up the stairs, blast everyone, and grab the medipack on the stairwell. Get the vest on the rooftop, then blast a path out through the SWAT teams.
The Snow Storm
If you've got a sniper rifle, you can shoot the first couple of guys with that. Then head into the old hospital and methodically clear everyone out. The room with the coke has two guys with guns and a bullet proof vest inside - you'll need it to escape from the cops. Don't get bogged down in a gunfight, just clear a path and grab one of the SUVs parked on the left as you leave.
PLAYBOY X'S MISSIONS
Deconstruction for Beginners
Although Playboy X wants you to go up on the roof with him, you don't have to - the three lookouts are on the end of each crane and you can shoot them from ground level with a sniper rifle. Switch to the AK as you enter the building site and be methodical before you move forward. Clean out as many people as you can before you shoot the third union boss - this'll send in a chopper full of backup for the final boss. You move in a fairly straight line, so as long as you don't dash forwards nobody shoot get behind you.
Here you'll need to use your mobile phone camera to identify your target, but as long as you get him vaguely in the shot you don't actually need to get a closeup of his face. Marlon's the one in the black jacket - he's got two cars parked for the getaway but you can pop him before he gets to them if you shoot straight away. If he makes it, they're both Patriots so you've got a tough chase ahead...
FRANCIS MCGREARY'S MISSIONS
Call And Collect
The blackmailer you're looking for's wearing a black and yellow puffy jacket. If you can't see him, just walk through the crowd - you can call him on the phone twice, but the second time Nico will start threatening him and scare him into running. There's no way to kill him without attracting police attention, so shoot him in the head and make a run for the nearest car.