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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.