May is the Goldilocks Zone of the Japanese calendar. Neither too hot nor too cold, it's the perfect time to take a trip and just about everyone does. The Golden Week holiday at the start of the month marks the peak of this period with packed trains and hotels being the norm. If you must travel in the first week of May, be sure to book early.
Apart from Hokkaido and northern Tohoku where they last till mid-May, cherry blossoms have either thinned out or vanished by the start of the month. The good news is there are plenty of other flowering plants to enjoy in various parts of Japan.
In Tochigi Prefecture, Ashikaga Flower Park hosts a wisteria viewing event from April 18 to May 20. The month-long festival showcases 150 year old wisteria trees, illuminated by night for added effect. Within easy reach of Tokyo, it's the perfect way to spend a leisurely night in spring.
Another good place for wisteria is the Kawachi Fujien Wisteria Garden in Fukuoka. Peaking in early May, Kawachi boasts a long wisteria tunnel perfect for photos.
You can find other floral hotspots all around Japan. The hillsides of Hitachi Seaside Park in Ibaraki come alive with the soft blue of countless Nemophila blossoms (late April to mid-May), while in nearby Saitama pink and purple shibazakura, or moss flox ignite the fields with radiant hues (mid-April to late May).
The May sumo tournament takes place in Tokyo over two weeks from May 13 to 27, with advance tickets available online from April 7. The last day promises more drama than usual as final results shape the careers of competitors, sometimes cementing all-important rankings.
If you're in the capital around May 20, consider attending the Sanja Matsuri at Sensoji Temple. This major festival event, in which portable shrines are paraded through the streets, attracts over a million people annually.
On a more sedate note, Tokyo Big Site hosts the annual Design Festa in which 10,000 artists from around the world display their works in a huge event space.
With Kamikochi and the Tateyama Kurobe Alpine Route opening in April, a third option for exploring the Northern Japan Alps arrives in May with the opening of the Kurobe Gorge Railway.
From the first of the month, you can ride the rails across deep ravines into the still snowy Tateyama Mountains. Though crowded at peak periods, it offers a nice alternative to the usual tourist fare.