First, they took all of N64 mushroom cup except Moo Moo Farm, interesting choice, but Luigi Raceway and kalimari are two of my favs from 64 so whatever. I really like Music Park from the new courses. DK island and rainbow road are really good too, i dont like Rosalina ice world as much, mostly because it fucking difficult. Also, as monkey mentioned above, Ive played locked tracks online in MKDS as well, but how did the people who hosted those matches get the game to do that? Did you do it monkey?
Lastly, I really like Rock Rock Mountain and Piranha Plant Pipeway as well.