I have the same JazzEd version, but I'm remembering information from 2005-06 so the version I used back then might have been different.

Are you sure none of the vehicles show up? I can get all of the boards and one of the ships to appear. And even though the hang glider doesn't show up, if you run over the spot that you put it in, Jazz does start riding it.
EDIT- And by "ride it", I mean "stand completely still". Which still kind of counts