Things to do · Destination Guide
Kuroshio coral reefs, southern Honshu headlands and genuine mainland dive days
Pick an activity mode to compare signature sites, skill fit, and gear planning notes before you lock your trip.
Kushimoto is a land-based Pacific-coast dive destination built around short shore and day-boat outings. Its Kuroshio-influenced reefs support table corals, reef fish, small crustaceans, nudibranchs and seasonal schools. Use the Kushimoto town operators for an easy first experience at the park-front beach or protected boat sites; offshore Asaji and deeper Black Tunnel are a separate advanced decision. Susami, farther west, has actual local dive services including Club Noah Susami and a shore underwater postbox dive. Aqua Vista Kushimoto advertises English small groups; Marine Stage and Kushimoto Diving Park publish other direct local options. Sites are conditional on weather, fishing activity, access rules and certification.
Kushimoto Diving Park Front Beach
Facility-managed shallow coral-entry area with a marked local route; an approachable coral dive only while entry and operator facilities are open.
Glass World
Operator-published inshore reef for wrasses, small reef species, coral structures and macro photography; comparatively accessible to certified beginners with suitable conditions.
Futajima-oki Ni-no-ne
Boat-accessed long reef and drop-off with soft coral, reef fish and possible current.
Susami Underwater Mailbox
Local Susami shore dive at a submerged working postbox reached through a dive provider; a scuba activity, not a snorkeling or self-guided swim recommendation.
Asaji
More exposed offshore pinnacle rising from deep water, with pelagic potential and major depth/current variation; intermediate-to-advanced guides only, no automatic deep or overhead access.
Black Tunnel
JNTO describes a deep advanced point over 30 m.
Operator Checklist
Reserve a local shop directly, share certification, logged dives, last dive, desired depth and any medical issues, and ask which site the sea permits that day. Aqua Vista lists year-round English small-group service, while Marine Stage provides guided packages including fishery contributions. For Susami, contact the Susami operator separately. Do not assume an advertised timetable guarantees a departure. The older Kushimoto Marine Park experience-program page explicitly says those guided introductory programs are currently suspended; its historical prices are not proof of resumed service. Park facility use and guided dives are distinct services.
Conditions Fallback
Avoid