Aogashima is in the Izu Islands.
Aogashima is a small island South of, and administered by, Tokyo. As of 2009 the islands population was 205.
Ferrys depart daily from Hachijojima and take approximately 2.5 hours (¥2500) but are weather dependant. You can also get a much quicker and dearer helicopter (¥11,500).
Its small, you can walk to most places.
The double volcano.
Walk around, hike or visit a hot spring.
Camping or stay at a minshuku.