Vehicles
Buggy
You'll come across the Buggy early in the game. It's great for running people over and often comes equipped with a .50 caliber machine gun. Due to the Buggy's light weight, it drives pretty fast and can handle just about any kind of terrain. It's possible to get the buggy stuck while speeding through the jungle, so keep your eyes on the road. If you happen to crash into a palm tree while driving at full-speed, prepare to blow up and die.
Gun Boat
Armed with a .50 caliber machine gun, the gun boat makes traveling the high seas a somewhat safe affair. When under attack, the gun boat's high speed lets you jet from danger in a hurry. Just don't get it stuck on shore, you'll need to jump out and push it back in the water.
Paraglider
Nothing quite like a peaceful flight through paradise on a paraglider. Used for emergency transportation by mercs on the island, the paraglider lets you sail across the island with relative ease. Of course, chances are you'll always be getting shot at mid-flight, but it's still a fun way to get around.
HMMV (Humvee)
While you can't drive tanks in Far Cry, you can still cruise around in a hummer. The Humvee can be described as a Buggy on steroids -- It's better armed and features thicker armor. Humvees often come equipped with .50 caliber machine guns. Some Humvee's come with a TOW rocket launcher. Yummy.
Zodiac
The Zodiac is lightweight raft you'll come across early in the game. The Zodiac runs fast and quite, perfect for getting you somewhere fast.