Waluigi's pinball , tick-tock clock , airship fortress . luigi's mansion = DS tracks
Warios stadium , moo moo farm , toads turnpike , bowsers castle = N64 tracks
Daisey cruiser , mushroom city , yoshi's circuit , Wario Colosseum = GC tracks
Coconut Mall , warios goldmine , maple treeway , grumble volcano = WII tracks
I know some of these have already been used in other games as retro tracks but i think they are the best 4 tracks from each mario kart game iv played (n64 bowsers castle being my fave mk track ever)