The best way to taking down a Ghost is by using the sniper rifle and aiming for the gas tank (silver circle) which is located on the left side under the drivers seat. If you hit this the Ghost will explode into blue flames.
Sword Launch: In order to do this you must have a sword.Look up (In front of a wall works best) and left click the mouse to do the launch attack and Jump at the same time. This will cause you to jump alot higher then you normaly would.
Gravity Gun: In front of the wheel should be a wall. On the right of the wall should be a turret (Or where the turret usualy would be). Act like your going to get on the Turret but then look right. You should see a wall.Use the Sword Launch to get on top of the wall. There is the Gravity Gun floating in mid air. To use the Gravity gun aim at the ground, hold in the Fire button, Release then jump. You will see a huge plast come out of the gun and you will go flying high in the air.
Get on top of Wheel / Spray Paint Can: In order to do this you must have a Sword and a Gravity Rifle. There should be a Plasma Rifle by the right side of the wheel (looking from where the wall is).Left of the Plasma Rifle should be a wall. Get in front of the wall. Look upward.Use the Sword Launch to get on top of a ledge (This will take a few trys). Next use the Gravity Rifle or Sword launch combined with a Human grenade to launch yourself in mid air. Then make sure you press forward to get on top of the wheel. There will be a hole in the middle of the wheel so watch out. There will be a spray paint can on top of the wheel. Its not affective at all when you fire it but melle can be surprisingly Lethal!
Get on top of Structure (Near Ocean / Next to Building): In order to do this trick you must have a Sword. Go to where the Sniper is left of the Wheel. Right of the sniper should be an area that goes upward and is a pretty good for Sniping. There should be a wall. Go in front of the wall. Look upward. Use the Sword Launch to get above the wall. Now walk left and you can be on top of the structure above the ocean. Walk right and you can get on top of the structure next to Zanzibar's Building. Walk even farther right and you can get on top of Zanzibar's Rocks.