Touge is not neccecarilly what it was to be, but yes, those kind of roads would be good fun to drive or race.
It could be road rallies, like the classic targa races like the targa Florio in sicily, segments of the mille miglia, or other old road tracks that are twisty like Pescara, Brno, Mugello etc. (I also would like the faster, less twisty classics like Rheims but thats a different story).
There could be more Tarmac rallies, like the rally of Catalunya for example, or more likely taking roads from places like the Alps, Carpathy, Wyoming, Japan, even places like North-Western China (if PD could go there), or even Fantasy mountain roads would do. PD could use real roads and just put up those unbreakable barriers where need be (ala citta, Costa, Grand canyon etc.). The whole charm of those roads is that they are thin, bumpy, with elevation changes and constant curves and twisties. Who wouldnt want to takle those roads in an Amuse S2000 R1 aka Touge Monster. 👍