Give me your Mario Kart Worldwide Ideas!

So as you might know i'm making a multicup called "Mario Kart Worldwide" that is based on Quick Mode but i change the textures/some things in the levels. And now that i've covered the SNES part, i need help for the GBA part. Find any theme, absolutely anything, and i'll make it a track.

If you want to play the multicup:


Now, get your pencils ready!

make tsukuba circuit or monza circuit