Here are several classic and lesser-known off-the-beaten-path travel routes outside of Kansai region in Japan. They are less crowded, offer beautiful scenery and provide a unique experience, and avoid the crowds:
Tottori Prefecture: A secluded mountain and sea paradise (in China region)

Tottori is the least populated prefecture in Japan, preserving a very pristine mountain and sea landscape. It is suitable for tourists who prefer niche leisure activities:
White Rabbit Shrine: Named after the oldest Japanese myth "The White Rabbit of Inaba", it is a niche shrine dedicated to seeking good fortune. It is located behind the White Rabbit Coast, with a fresh and unique landscape. There are very few tourists.
Takayama Mountain, Izumo: Known as the "mini Mount Fuji", it is one of the three major peaks in Japan and is an excellent destination for leisure hiking and skiing.

2. Jizai + Fungai + Kanai: Islands of Art in the Seto Inland Sea (Shikoku Region)
These three small islands are top contemporary art destinations in Japan, far from popular tourist attractions, suitable for art and nature lovers.
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3. Mount Sanyo Walking Route (Nagano Prefecture): Traversing the Ancient Mountain Trails of the Edo Period
This ancient trail connects Tokyo and Kyoto. During the Edo period, it was a major route for samurais and pilgrims. Nowadays, most sections retain their original appearance, and most areas are sparsely visited by tourists.

4. Kyushu + Minor Natural Routes in Central Region: The Original Outdoor Paradise
‌Around Kanazawa in Ishikawa Prefecture: Kanazakken Garden is one of the three famous gardens in Japan. Each season features different flower landscapes. The riverside café in Kakusenkei Canyon allows you to taste local Kaga Matcha and desserts, providing a very niche and exquisite experience. ‌Ise-Shima in Mie Prefecture: Rich in historical shrines, waterfalls and forests, with over 1,000 kilometers of coastline. In summer, you can go kayaking in the Kuroya Sea, and enjoy the uninhabited islands and the verdant mountains. It is a summer resort that is only known to local people in Japan.