I've been looking for the location of the circus task, and I found a place that looks similar to the pics:
The place is the "Escuela Nacional Circo Para Todos"
Good Job!
Based on this, i think we have a missing task. Look:
1St Clue: Nemacon Salt Mine (1h40 from the airport)
Next clue: ? (might be a detour in nemacon)
Next Clue: Problably Escuela Nacional Circo Para Todos, which is located in Bogotá
Next Clue: Truck Task (At the preview we can see Will with the clown make up), so this must be in Bogotá
Next: Pit Stop
In my opinion there is a missing detour in Nemacon Region. They woudn't go to Nemacon Region just to a yield.
Let's see. Bogotá is so beautiful to do only this tasks.