The Boat Lara can jump into the boat from ledges above and climb into the boat from the water.
The Boat
Lara can jump into the boat from ledges above and climb into the
boat from the water.
Driving - The boat is controlled with the arrow keys. Press direction key in the direction that you want the boat to move.
Turbo - Press the action key and the up button for turbo. This allows the boat to go up ramps and make jumps. Careful, running into walls makes Lara lose some of her health.
Slow speed - Holding down the walk key while driving the boat will cause the boat to go really really slow.
Going Ashore - Aye matey, by pressing one of the side
arrow keys and press the jump button will cause Lara to
jump out of the boat.
The
Snowmobile 
Lara will not jump onto the snowmobile. The fun part about
the snowmobile is that Lara can easily kill guys by running them
over. As long as they don't have a snowmobile of their own.
Driving - The snowmobile is controlled with the arrow buttons. Press the direction key in the direction that you want the snowmobile to move.
Turbo - Press the action key and the up arrow for turbo. This allows the snowmobile to make long jumps. Careful, Lara loses health every time she hits a wall with turbo.
Slow Speed - Holding down the walk key will slow the snowmobile down. Don't try any long jumps while you're in this mode unless you're one of those satirical types and want to see Lara plummet to her screaming demise.
Getting Off of the Snowmobile - Press one of the side arrow keys and press the jump button to make Lara get off of the snowmobile. Or, you can do what I did and start hitting all of the buttons at once until Lara gets off the snowmobile. I advice the former- it's a lot faster and more economical way to get Lara off the snowmobile. It also doesn't break your controller.