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Updated: October 19, 2022

Popular island for hiking, snorkeling and splashing around

Kozushima Island is a family-friendly destination with sandy beaches, an ultra-fun clifftop promenade and a snorkel-swim play area. It also caters to more adventurous travelers with challenging hiking trails and dive spots.


  • Beautiful beaches and inviting turquoise waters
  • Snorkeling and diving
  • Hiking Mt. Tenjyo

How to Get There

From Tokyo Takeshiba Pier: High-speed jet ferry takes about four hours. Or the large passenger ships depart at night and take about twelve hours.
From Tokyo Chofu Airport: Flight time: 35 minutes.

Turquoise waters and starry skies

One of the main reasons for taking a trip to Kozushima is its sandy beaches and beautiful blue waters. From Kozushima Port, the most convenient beach is Maehama. Within walking distance, you will find shops selling ice creams, inflatables and other essential beach equipment.

Maehama Beach

Maehama—Kozushima’s main beach

Further north along the island's west coast, Nagahama and Sawajiri are pleasant beaches with relatively calm waters and simple facilities for barbecuing and picnicking. While there are no shops or restaurants around either beach, there is a hot spring facility nearby where you clean off the sand and take a relaxing dip at the end of the day. From the outdoor bath, you can watch the sun set out on the horizon.

Kozushima is the first island in Tokyo to be designated as an International Dark Sky Park (a Dark Sky Island) for its efforts in preserving dark night skies and protecting the nocturnal environment. Take a stargazing tour with a local guide, appreciate the starry night sky, and wonder at the grandeur of the universe.

View of sunset seen from the Nagahama Beach

The sunset from Nagahama Beach

Starry sky at Yotane Square

The night sky of Kozushima, recognized as a Dark Sky Island

If you are staying at the Tako Bay campsite on the east side of the island, the most convenient beach is located next to Miura Port. The waves can be a little rough, but there is a small shallow section sheltered by the port’s sea wall ideal for even the most inexperienced swimmers.

Miura Port

Miura Port

Snorkel the day away

For snorkeling, head to the Akasaki Promenade on the northwest tip of the island. Resembling a giant wooden jungle gym, the raised walkway has jumping-off points, spans rocky outcrops, and snakes along the coast. You can easily spend a fun-filled few hours here, and there is a shop near the bus stop selling snacks and light refreshments should you need more energy. To see more of Kozushima’s marine life, book a scuba dive at one of the island’s dive shops.

Snorkeling spot seen from the Akasaki Promenade
Diving platform on the Akasaki Promenade
Akasaki Promenade
Kozushima Coral Reef


Challenge yourself with a hike

If you like to keep active on vacation, consider climbing Mt. Tenjyo, the tallest of the island’s peaks. From Kozushima Port, the 572-meter ascent takes between four and five hours. You can choose from several different trails suited to varying levels of fitness. At the summit, there is a small heart-shaped pond and on an exceptionally clear day, it is even possible to make out Mt. Fuji far off on the horizon.

Fudo Pond
Mt.Tenjo rising behind the village

Mt. Tenjyo in the background and the pond at the summit



Observation Decks


Nearby Attractions