Things to do · Destination Guide
Volcanic shore dives, seasonal hammerhead encounters and island trails near Tokyo.
Pick an activity mode to compare signature sites, skill fit, and gear planning notes before you lock your trip.
Akinohama, Nodahama, O-no-hama, Keikai and Toshiki span ladder-assisted reef entries, arches, lava walls, current and seasonal pelagic dives. The local diving council regulates shore routes and gear. SeaSound describes boat sites Yaiso and Kagene for intermediate and more experienced divers, so shore-only older tourism copy is incomplete. Local providers include Uminowa and SeaSound. Operator site notes; local rules.
Nodahama
Relatively shallow northwest lava structures and a visually notable arch, with fish and varied reefs.
Keikai
Dramatic lava ridges and a seasonal early-morning hammerhead reputation.
O-no-hama
Western volcanic reef with table corals and possible turtle sightings.
Toshiki
Southern lava cliffs, strong water exchange and a nearby shallow enclosed swimming area.
Kagene
Offshore eastern rocky reef advertised by SeaSound to intermediate and above divers.
Akinohama
Classic northeast island shore entry with ladder-assisted exit, ledges and macro-search habitat.
Yaiso
Operator-described current-influenced boat site with arches, soft corals and a rock formation.
Operator Checklist
Book a council-affiliated local dive service, confirm exact entry rights and guided or self-guided eligibility, then request two or more shore alternatives. Uminowa lists two guided shore dives at JPY 13,600, excluding certain facility or rental charges, as updated September 2026. Keikai is a dawn specialist trip after a prior check dive, and your actual operator can set stricter thresholds than the council. No planned trip is evidence a specific boat has seats today. Do not treat any lava arch or tunnel as permission for penetration. Operator offer; council criteria.
Conditions Fallback
Avoid