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Alcatraz: On the second bend in the challenge where you have to manual the switchbacks the long quaterpipe that has a pice made of wood ride up it and spine transfer and you will fly down a hatch and appear through the old rusty shop front near the bigining.
Zoo: Isnt really secret this one but it is how to open the aquarium:
Near the elephant that a trainer next to it says: "be careful round old stompy here, Skate too close to her head and theres no telling what she'll do"
Jump off the cafe/shack near her on to her and grind her head. She will then go on a blind rampage and burst through into the aquarium!
Carnival: The Haunted house: Grind the rails just on the outside of the house and they will take you in either side of the house (depends on which way you grind) and you will be taken in side in which you are slowly pulled into a clowns head. (different head on each side of house)