Firstly, make sure the car you choose for your Aso Uchinomaki Onsen getaway will fit all your friends and your bags. When you’ve done that, consider where you’ll be driving. If you’re spending most of your time in downtown Kumamoto (which is just 2 miles away), pick a smaller ride to easily get around city traffic. Heading out of town more often? Choose something with a little more trunk space and legroom.