Mount Io is a reminder of nature's sheer power. Whether they're extinct, dormant or active, the landscapes around volcanoes are a sight to behold.
If you're trying to figure out what else there is to see after your visit to Mount Io in Hakodate, you have loads of choice. Stop by Hakodate Jomon Culture Center. It's conveniently close to the geological phenomenon and offers another insight into this area.