Miyakejima and Mikurajima

For a combined scuba-and-dolphin plan, May to early July balances in-season wildlife operations with warming water and fewer late-summer holiday pressures. Mikurajima dolphin boats may operate from around March 15 until November 15, although individual companies set shorter dates. Miyakejima's Megane Iwa is a separate controlled scuba dive usually offered in June and October. July and August are attractive for warm snorkeling, while September and October are vulnerable to typhoon disruption and heavy rain. Choose travel dates with spare days and ask each operator which precise days and ports they can serve.

No. Mikurajima Tourism Association guidance prohibits scuba approaches to resident dolphins, and its visitor FAQ says recreational scuba is not offered around the island's fast-current, steep underwater coast. Dolphin encounters are supervised snorkeling or breath-hold swimming from licensed local boats, with safety decisions made by the skipper. For actual scuba, stay on Miyakejima and choose a local dive shop from its tourism association directory. Do not assume that a dolphin boat carries tanks or that a marketing term such as "dive with dolphins" implies a lawful scuba product. No encounter is guaranteed.

The overnight Tokai Kisen passenger vessel leaves Tokyo Takeshiba and normally calls at Miyakejima before Mikurajima, subject to weather and port conditions. Miyakejima also has small-aircraft service from Chofu Airfield operated by New Central Airservice, around 50 minutes in the air. Mikurajima has no runway, but the Tokyo Ailand Shuttle helicopter provides limited island-to-island service. The exposed single port on Mikurajima can be skipped even when the ship sails, so a ticket is not proof of landing. Always check current operator timetables and actual departure status.

Do not plan an ordinary same-day ferry visit. Mikurajima Tourism Association says there are too few rooms for walk-ins and visitors must have confirmed accommodation before landing. Its ferry also has only one weather-exposed harbor, so arrival and departure can fail unpredictably. Arrange a listed lodge and its affiliated wildlife boat together and leave extra time after the planned return. If your priority is dolphin watching without a Mikurajima overnight stay, ask a Miyakejima-based certified operator about a currently offered open-ocean wildlife excursion. That is not public passenger transport between islands.

Follow the licensed boat captain and local conservation code. Do not touch, feed, chase or crowd dolphins; do not approach a pod with calves or repeat a swim on dolphins that do not voluntarily approach people. Flash, selfie sticks and artificial underwater noise devices are barred, and scuba approaches are prohibited. Guests enter the open ocean only when instructed. The tourist association recommends appropriate flotation or exposure protection and medical disclosure where relevant. Rules safeguard animals and visitors, not just photographs. Encounter quality varies with animal choice, current and swell, and a sighting percentage is not a guarantee.

For a first outing, ask a local guide to assess Chotaro-ike, a tidal rock pool known for fish watching, or a suitable calm-day beach such as Ofunato. The Miyakejima Tourism Association also lists Okubohama, Togahama and Kamanoshiri, but some coastlines have rapid currents, sharp volcanic rock and challenging entries. Chotaro-ike is snorkel-only, not scuba, and incoming waves can enter the pool at high tide. Lifeguards are stationed only on designated village dates. Bring properly fitted mask, snorkel, fins and protective footwear, because local snorkel retail is limited.

Okubohama offers characteristic volcanic shore diving and varied reef life. Gakkoshita has boulder entries and a reported drop-off; Togahama is known for coral and fish-watching. Tsuchikata is used by a local operator for shallow practice, while Kamanoshiri can be current-affected outside its entry zone. Megane Iwa stands out for rock arches and a constrained June/October boat-dive window. Choose locations with a listed local guide, confirm the current sea-use boundaries, and do not treat underwater arches as licensed overhead penetration.

The verified activity is guided breath-hold dolphin watching, not depth-line training or unrestricted freediving access. Boats operate in exposed current-affected ocean, and water entry is decided by the licensed skipper. A few Miyakejima scuba providers describe shallow skin-diving or snorkel practice, but this research did not verify a dedicated local freediving certification course, training buoy, instructor schedule or organized freediving event. A general dolphin-swim booking does not establish that training service. For this destination, keep the goal modest: strong swimming, controlled breathing, good buddy supervision and ethical wildlife observation, not a depth record.

Mikurajima has a single exposed harbor. When waves or current make landing unsafe, Tokai Kisen may pass the island or cancel the stop even if the wider ship route operates. The tourism association recommends generous trip buffers and explains that its small helicopter shuttle is usually difficult to secure at short notice, with very limited seats. If a landing is missed, contact the ship operator and your lodge promptly and follow the official diversion instructions. Do not rely on an unbooked helicopter or private dolphin boat to extract you. Hold flexible onward mainland arrangements wherever possible.

Miyakejima is strong for land activities: walk the Ako Lava Flow Trail, bird-watch near Tairo-ike and Akakokko Hall, visit Izu-misaki Lighthouse and relax at Furusato-no-Yu if the bath is open. Do not enter the restricted Mt. Oyama summit unless participating in a specifically authorized guided event. Mikurajima offers ancient-tree forests and nature trails, but most require a Tokyo-certified nature guide. The short Tanteiro route is a limited guide-free exception. A nonswimmer may be able to join a dolphin boat as an observer if that individual skipper accepts them.

Miyakejima lists hotels, small inns, dive-linked pensions and the Okubohama reserved campground, whose 2026 overnight tent season is published for April 1 to November 30. Mikurajima is different: the tourism association lists only a small group of guesthouses, a village lodge and reserved bungalows, and camping or sleeping outdoors is prohibited. Reserve Mikurajima accommodation before arranging a ship passage and ask the host to book or coordinate a certified dolphin-watching boat. Rooms can be allocated by lottery or on limited advance release dates, so do not infer last-minute supply.

Miyakejima operators describe fish schools, colorful reef species, nudibranchs, seasonal squid spawning and occasional sea turtles at sites such as Okubohama and Togahama. Around Mikurajima, the principal attraction is a resident Indo-Pacific bottlenose dolphin community, observed from a licensed small boat or by snorkeling and breath-hold when the crew allows it. All sightings are dependent on wildlife behavior, visibility and sea state. Dolphins should never be chased or touched, and a local claim about high encounter rates is not a personal guarantee. No specific shark or manta season was verified for this itinerary.

Miyakejima has a central clinic, and Mikurajima has a small local clinic. Miyakejima Village confirms that serious cases may require weather-dependent helicopter evacuation to mainland hospitals. This research did not verify an operational recompression chamber on either island, so check your dive operator's oxygen and emergency plan and obtain coverage for diving and evacuation. Japan's marine emergency number is 118 and ambulance/fire is 119. Mt. Oyama is an active volcano with controlled zones; even advertised guided crater-rim trips require special authorization. Follow current village alerts rather than treating an old trail map as permission.

No generally required island-wide diver tag or national-park visitor levy was identified in current official sources, so do not add one to a booking estimate. Permissions still matter: the Miyakejima sea-use council restricts scuba entries, and Megane Iwa is not available year-round. Mikurajima dolphin outings must follow the certified-guide arrangement and animal-welfare rules, with no independent scuba dolphin dives. Mikurajima forest hiking often requires an authorized guide. Specific paid examples include Miyakejima's onsen, nature-center admission and its campsite environmental contribution, and Mikurajima nature-guide charges. Confirm each current charge with its provider.