Hey, action9000, a little something I think I should tell you about the GC version of Mario Kart.
Now, Rainbow Road is STILL the last one, however, it is a tough course to beat. On top of long, it has TIGHT turns that you HAVE to slow down on just to make. (Even R turning doesn't help much.) Add on multiple boosters and a part FILLED with them that requires great control just to get past, and you've got one of THE funnest courses around.

Also, as a little bonus, if you get gold at all 4 courses, (Mushroom, Flower, Star & Special.) and on any desired level, (50cc, 100cc, 150cc, Mirror) you get a new cup course called All Tour Cup.
What All Tour Cup is, is basically all 16 courses. Over an hour of courses from all the cups to get the ultimate secret prize. Luigi Cuircut is still the first and Rainbow Road is still the last, but the rest are all random. (So if you are good at some and bad at others, luck is sometimes a BIG part of winning it.) And let's just say that you definately earn the prize at hand if you beat it. (Toad & Toadette, Boo & Petty Piharna, The Golden Car)
So if you plan on getting it now, let's just say there's plenty of fun to look forward to.
