I'm wondering the same thing. I think u have to use those floating pads some how but I'm
not sure. If u figure this out please help me. Hope that helps :)

That is what I call myself so if u see that that means its me

first you got to activate the 3 buttons in the 3rd race's level. Then you got to get to
the floating things, there are some plataforms that will guide you at the left side of the
entrace. You jump over the floating things (they will make kind of stairs) and youll reach
like a long corridor. at the end of the corridor theres another floating plataform. you
jump on it ant it will drive you to a kind of giant tree. there are some corners in the
tree. you must hang them. and then youll have to jump over some plataforms. at least,
thats what i came up with

Yeah, you have to get to the ledges on the tree thing, from the highest one you jump to
the stone ledge and follow the ledges round. Then jump to a free standing ledge in the
middle and then another ledge attatched to the side of the world. Hope this helps. :)

There should be a rope and when you approach it it will blink the square or x button, im
not sure about game cube though