I would choose my own track. Husky Grand Prix. "24 hours of Husky." No, siriously, I came up with this awesome track on the editor. It´s so relaxing and fluid. Ussually you don´t go less than 220KMH. But it has several turns as well. A great track to push you car to the limit, without being boring like an oval. I love it.
I guess Monaco would be cool too. But it will certainly be demolishing in every sense of the word. Even if you know it by heart, it´s a demanding track. I remember the endurance event on GT4 on that same track, even with B-Spec helping you now and then, it consumed you only with 90 laps.
If I would choose a real track or a GT track, I would say the "24 hours of Cape Ring" for an original, and maybe Monaco, like your choice, or Indy and Daytona in their road configurations.