Amped 3

Enter RT, X, LT, Down, Right, LB, LT, RT, Y, X as a code at the "Cheat Codes" screen under the options menu to unlock all sleds.

Accomplish the indicated task to get Gamer Points:

Laax Stock And Barrel: Impress a number of bystanders in Laax
Northstar Nirvana: Impress a number of bystanders in Northstar
Rescued Weiner Boy!: Successfully complete Act 3
King Of The Mountain Lab: Impress a number of bystanders in DC
Snowbird Bound!: Successfully complete Act 1
Snowbird Dawg: Impress a number of bystanders in Snowbird
Viva Valle!: Impress a number of bystanders in Valle Nevado
Vamonos A South America: Successfully complete Act 2

Complete Story mode to unlock the Hang Glider slide.

Get the indicated number of points in a combo to unlock the corresponding item in Park Builder mode:

Lighthouse: 1,000,000 points
Helicopter: 800,000 points

Select cheat codes from the option screen and press x(x4), y(x3), x.

Choose "Options" from the main menu, then select "Cheat Codes" and enter the following: LT, RT, UP, UP, RB, LEFT, RIGHT,, X, Y, LB.

Choose "Options" from the main menu, then select "Cheat Codes" and enter the following: RIGHT, LB, LT, X, LEFT, ROB, RT, Y, LT, X.

Choose "Options" from the main menu, then select "Cheat Codes" and enter the following: Y, DOWN, UP, LEFT, RIGHT, LB, RIGHT, RT, RT, RB.

Choose "Options" from the main menu, then select "Cheat Codes" and enter the following: UP, LEFT, RT, RB, RT, UP, DOWN, LEFT, Y, LT.

Select cheat codes from the options screen and press down,x,right,left bumper,right,right bumper,x,right trigger,left trigger,y.