I understand that there is a bus service that goes up to Asosan from Aso station or village. Where can I find the schedule, as on the day of my visit I need to catch the 15:44 train back to Kumamoto.
Alternatively, I was thinking of renting a car for 6 hours. Are there any car rentals within Aso? Lonely Planet's guide says there is but I'm not sure if the info is updated.