From Kumamoto to Beppu, a railroad stretches straight through the Mt.Aso-caldera and connects East and West. Roads are few, but (foot)paths are going in all directions.
By foot you will discover the nicest places. There are few busservices but not with tight or even frequent scheduels.
Namino Station is a JR Hohi Line train station located at the highest point (754m above sea level) in Kushu region.