Pappy Land:

Pappy Land, a secret stunt course hidden in 
track 6, is located at the bottom of one of
the many mountains in the level. To find it,
follow the pathway which passes a white citadel
(at top of mountain) and then leads into the 
dirt path which, if taken wrong, can send cars
barreling over the edge of the cliff. Pappy 
Land is located directly over the mountain's 
cliff facing away from the citadel. It's at 
the bottom of the mountain right next to the
ocean, so be careful making the trip down.