Things to do · Destination Guide
Japan's rare-macro reefs, protected coral bays and wild Shikoku headlands in one two-base road trip.
Pick an activity mode to compare signature sites, skill fit, and gear planning notes before you lock your trip.
Kashiwajima is a compact, boat-based macro-photography destination. JNTO highlights Ushironohama and unusually varied temperate and tropical reef life. AQUAS and Paradi operate from Kashiwajima. In a separate Tosashimizu circuit, Tatsukushi Diving Center runs guided and introductory dives near Tatsukushi Marine Park; Ashizuri sites need a separately confirmed local departure. Neither bay is an automatic boat link to the other.
Ushironohama (Kashiwajima)
JNTO specifically names this Kashiwajima-area reef for rich fish assemblages and underwater topography; use the current local operator for legal boat access.
Tatsukushi Marine Park dive area
Designated marine park coral scenery and guided local scuba with Tatsukushi Diving Center; the exact permitted entry and zone must be confirmed.
Fish Island / Honbae (Tatsukushi operator report)
Named in an October 2026 Tatsukushi Diving Center dive log, which verifies actual local use at that time but not continuous public access.
Cape Ashizuri local dive area
JNTO describes current-influenced reefs and pelagic potential; launch point, exposure and advanced-skill suitability require a specific operator confirmation.
Operator Checklist
Reserve a named Kashiwajima or Tatsukushi shop directly, provide certification, logged dives and medical information, and request weather-dependent site choices. AQUAS lists introductory dives Apr-Nov and reports typical fun diving Mar-Nov; Tatsukushi Diving Center advertises year-round certified diving but Apr-Nov experiences. These are operator-specific, not a regional guarantee. Bring your dive computer and allow a flight-free buffer, especially for repetitive dives. Do not plan a same-day dive circuit between both coasts by boat.
Conditions Fallback
Avoid