I honestly wouldn't really care.
No bowser castle? No ghost house?
Also, they'd have to be real world kart tracks... otherwise a single lap would take very long. It would ruin it.
Where is the option I would'nt play it either way?
Real world tracks are boring in comparison. The Corkscrew at Laguna Seca is the only spot remotely outlandish. It wouldn't fit the game at all. Mario Kart has jumps, tunnels, mud pit, lava, volcanos that you reach by being shot through a cannon, etc. No, thanks. I'll take my cruise ships, dinosaurs, and rope bridges over banana peels on the Nordschieffe any day.