Discover Kozushima: Tokyo's Hidden Island Paradise in the Izu Chain
Is Tokyo Still Here? A Cluster of Volcanic Islands Within City Limits
South of Tokyo stretches a chain of volcanic islands in Fuji-Hakone-Izu National Park, often overlooked by visitors to Japan's capital. Known as the Izu Islands, this archipelago includes over a dozen islands and islets.
Nine are inhabited, each providing a unique escape. Kozushima stands out as an undiscovered gem offering snorkeling, hot springs, hikes, and dives amid geological wonders and freshwater springs—all still part of Tokyo.
Unlike Tokyo's neon glow, Kozushima preserves its dark skies for stargazing year-round. With abundant outdoor activities, local cuisine, and crafts, it's an ideal Japan itinerary addition. This emerald-watered haven with pristine beaches and trails is reachable by 4-hour ferry or 35-minute flight from Tokyo.
Main Attractions: Akasaki Promenade, White-Sand Beaches, and Unique Geology
Near Maehama Beach, Kozushima's only microbrewery and distillery await. Cool off with craft beer at Hyuga Brewery or sample Moriwaka, an oak-cask shochu unique to the island, at Kozushima Sake Brewery.
The 500-meter Akasaki Promenade hugs the rocky northwest coast, with the sea just below. Summer visitors jump from 3-meter 'exits' into calm inlets perfect for snorkeling amid coral and colorful fish. Rentals, gear, and refreshments are available on-site.
As part of Fuji-Hakone-Izu National Park and one of Tokyo's 11 Treasure Islands, Kozushima features stunning landscapes. Its Paleolithic obsidian cliffs—volcanic glass—yielded Jomon-era tools (13,000–300 BCE) found across the Kanto region.
The locally made Moriwaka shochu, carefully stored at Kozushima Sake Brewery. Photo credit: Kozushima Sake Brewery
Akasaki Promenade: a snorkeler's and diver's delight.
Beyond the Beach: Epic Hikes, Hot Springs, and World-Class Stargazing
Maehama Beach draws crowds, but Kozushima's inland adventures captivate nature enthusiasts.
Tackle Mt. Tenjo's 572-meter summit via Kuroshima Trail (4-5 hours round trip). Expect volcanic ridges, desert-like terrain, ponds, and Hairanaigasawa, a sacred spring source. Easier access starts at Shiratori Trailhead's 6th station (30-minute walk). For milder hikes, Matsuyama Promenade (175m peak) overlooks Takou Bay, with fresh spring water at Takou Spring.
Unwind at Hot Spring Health Center's oceanfront baths (bathing suits required outdoors). Open late for stargazing, it features saunas, jacuzzis, and Milky Way views.
An International Dark-Sky certified spot, Kozushima minimizes light pollution. View the Milky Way from Miura Bay Observatory, Akasaki Promenade, or Yotane Square. Trained guides from Kozushima Tourism Association or Wataru Furuya's Full Earth tours enhance the experience.
Unobstructed Milky Way views make stargazing magical. Photo credit: Wataru Furuya (Full Earth)
Unique Stays: Ryokans, Camping, and Glamping on Neighboring Shikinejima
Camp under stars at Tokyo Metropolitan Takou-wan Park Family Campground. Onsite staff, rental tents on decks, showers, and cooking areas ensure comfort. Book ahead.
Family-run ryokans near Maehama Beach offer AC rooms and fresh seafood meals.
Cross to Shikinejima for Nagi Glamping's air-conditioned yurts (up to 4 guests) with beds, fridge, and Omakase dinners featuring local seafood and drinks.
Kozushima and Shikinejima deliver beaches, hikes, scenery, and cuisine—Tokyo's island escape for every traveler.
Prime camping at Takou-wan Park. Photo credit: Tokyo Metropolitan Takou-wan Park Family Campground
Nagi Glamping on Shikinejima. Photo credit: Nagi Glamping
