Fuji is my most hated track lol, what a waste of space :) Interlagos is all right depending on the people playing. DT Seaside is one of my favorite fictional tracks. However the best track in the world is (race this morning) Nurburgring 24H circuit.
The long version of the Ring is in almost every track-based racing games. It is one of my least favorite tracks. I do like the short version of the track but wouldn't call it one of my favorites. When it comes to longer tracks I think LeMans is my favorite track. I also like the LeMans short track the Bugatti Circuit that track is in very few track-based racing games.