Overlooking Kagoshima City in southern Kyushu, Sakurajima volcano has had a few devastating eruptions over the last two hundred years, one of which bridged the gap between the island and Osumi Peninsula. There is a regular ferry to Sakurajima from Kagoshima that runs every 10-15 minutes.
Also of note... I got a job offer with another English conversation school. Still waiting on location and salary.