Hokkaido is second largest, northenmost and least developed of Japan´s four main islands. Its unspoiled nature attracts outdoor lovers as well as skiers in winter. Sapporo is its biggest city and its only 4 hours by direct train from Tokyo. On your way you’ll travel through the Seikan tunnel, the longest underwater tunnel in the world.
Best time to visit: summer, for winter sports winter
More information: https://www.travelnation.co.uk/blog/20-amazing-things-to-do-in-hokkaido-japan
7. Shimanami Kaidou
Shimanami Kaido is a 60 kilometer long toll road that connects Japan's main island of Honshu to the island of Shikoku, passing over six small islands in the Seto Inland Sea. You can go on foot or by bicycle. Bike route is about 70 km but can be comfortably completed in a day by intermediate cyclists.
Best time to visit: from spring to autumn.
More information: https://www.japan-guide.com/e/e3478.html
Kanazawa's unchallenged main attraction is Kenrokuen, one of Japan's "three best landscape gardens" and by many considered the most beautiful of them all. The city escaped destruction by WWII air raids, thus parts of the old castle town, such as Nagamachi samurai district and chaya entertainment districts, have survived in pretty good condition.
Best time to visit: winter, spring, autumn
More information: https://www.japan-guide.com/e/e2167.html
9. Mount Fuji
Mount Fuji is the highest mountain of Japan (3776 m) and an active volcano (last eruption 1707). It is nearly perfectly shaped volcano and can be seen from Tokyo and Yokohama on clear days.
Visibility tends to be better during the colder seasons of the year than in summer, and in the early morning and late evening hours than during the middle of the day.
If you want to enjoy Mount Fuji at a more leisurely pace and from a nice natural surrounding, you should head to the Fuji Five Lake (Fujigoko) region at the northern foot of the mountain, or to Hakone, a nearby hot spring resort. Mount Fuji is officially open for climbing during July and August via several routes.
Best time to visit: summer and autumn
More information: https://www.japan-guide.com/e/e2172.html
Climbing Mount Fuji: https://www.japan-guide.com/e/e6901.html
Tokyo is Japan's capital and the world's most populous metropolis and offers a seemingly unlimited choice of shopping, entertainment, culture and dining to its visitors. The city's history can be appreciated in districts such as Asakusa and in many excellent museums, historic temples and gardens. Contrary to common perception, Tokyo also offers a number of attractive green spaces in the city center and within relatively short train rides at its outskirts.
Best to visit: all seasons
More information: https://www.japan-guide.com/e/e2164.html
And that concludes Shin´s recommendations for Japan. I hope you have enjoyed it! I have had a wonderful time learning about Japan and want to visit it now even more:)