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Japan’s Most Popular Scenic Hikes. Best Season Examples. KOUZUSHIMA-island.Tenjōzan

SUWANOSEJIMA

🇯🇵 Ira | Island Manga Artist 🇸🇬
🌏 Traits: ADHD / ASD, IQ 115, BMI 17.7
✒️ International Island Manga: MAHARAJIMA (まはらじま)
🇸🇬 Life Abroad: Attained Singapore PR as a "Singapore NEET"
 🇹🇼 First Japanese national to successfully explore all inhabited islands in Taiwan (2025)
 ⛴️ Explored 500+ islands in just under 3 years
 🌏 World Record Holder for the fastest completion

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The best seasons are spring and fall. Especially late May.

SUWANOSEJIMA

The gentle pink flowers of the large-leaved azalea are now at their peak. This article features scenes from a trek in early June.
In recent years, due to global warming and intense heat, I thought the peak viewing period might be mid-May. While the official site lists late May, other islands in the Izu archipelago also show a trend of earlier blooming.

Tenjō Mountain: Beginners welcome

KODAKARAJIMA

The path to the summit is straightforward. There are many landmarks and signs along the way.

Mount Tenjō, a popular trekking spot, is located almost at the center of Kozushima.
The entire route takes about 6 hours to complete. Allow 7 hours for a leisurely pace.
Mount Tenjō has long been considered a sacred place on the island and is also a Special Protection Zone within the national park, so collecting plants is prohibited.

TOKYO-TOSHIMA

The following is an example hiking route departing the lodge on foot just after 5:00 AM and returning around 10:30 AM. During Ira’s hike, the descent trailhead was blocked by fallen trees, causing a delay that made us miss the bus.
Normally, if you catch the bus, you should be back at the lodge by 10:00 AM, so the round trip from the village takes about 5 hours.

Scenery along the Kurotori Mountain Trail:黒鳥登山道

Scenery along the Swan Mountain Trail:白鳥登山道

Kozushima Island

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Top Pages for Each Island in the Izu Islands

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Ira(アイラ): World record holder for exploring over 500 islands in just about 3 years.
As an island manga artist, Ira serves as a valuable social example of leveraging ADHD and ASD traits to their fullest.
Author of the international island manga MAHARAJIMA(まはらじま).
Holds Singapore Permanent Residency (PR) and a Master’s degree in Intellectual Property.
[Link to Profile & Achievements]
[YouTube Channels: 1. Islands & Unexplored Regions | 2. Singapore & Mountains]

TAKARAJIMA

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