Its my favourite game ever, although there can always be improvements.
+ More likeable main character (Jimmy while good kid at heart is a jerk)
+ More ways of transport (like bikes, but we could have scooters, moterbikes, go karts, stuff like that to use around the school)
+ New city, schools and such (I've completed on Playstation to death , played it on Wii to death and now I'm playing it on Xbox to death so I want more areas and generally a new school)
I really cant think of anything else its almost perfect. I love it