Ashikita Roller Luging
This is really fun! Jet down a concrete course on a sled. Depending on you, it can be extremely safe and fun; or it can extremely dangerous and fun, and you may leave some skin and blood on the course.
Google coordinates: 32.319924,130.472431

Motorcycle riding at the Honda track in Ozu
You can ride 100cc dirt bikes on their off-road course. I don’t remember how much it costs. Maybe 3000-5000 for all day.
Google coordinates: 32.901569,130.876694

Emiasu water slides! (エミナス)
This is a waterslide park near Kumamoto airport. Its super fun!
Google coordinates: 32.823814,130.847039

Aso Farm Land
It’s a family fun park. It has all kinds of stuff. This place has amazing Christmas light displays during Christmas time. Very beautiful.
Google coordinates: 32.896291,131.003938