Cool! I have the Mario Kart Wii strategy guide as well. I think I also have all the karts. I gold-trophied everything except for Mirror, which I haven't finished yet. I still have to unlock Dry Bowser and a few others as well.
Well, I always get 1st in the 150cc hard places as well, and I can go pretty far ahead.
And my liking Wario's Gold Mine actually has nothing to do with Wario. Other than the easy to knock-off places, I like other courses way more than Wario's Gold Mine, such as Maple Treeway and N64 Mario Raceway.
I made a really big video of how my sister and I basically made Baby Peach 12th 12 races in a row, or something.