Cherry blossom viewing in Japan is one of the most important traditional events in Japan in the spring, and is known as Hanami (花见). During cherry blossom viewing, people gather in parks, gardens or along riverbanks to enjoy the beauty of cherry blossoms. Here are some customs and foods related to cherry blossom viewing in Japan:

1. Sakura Matsuri: In some places, a cherry blossom festival is organized, which includes traditional dances, musical performances and celebrations that add to the fun atmosphere.

2. Cherry blossom viewing under a cloth ball: In some parks or gardens, people spread mats and cloth balls and sit under the cherry blossom trees for a better view of the blossoms.

3. Cherry blossom viewing decorations: people will wear traditional kimono or yukata and carry umbrellas and fans to add to the festive atmosphere.

4. Cherry blossom viewing food: When viewing cherry blossoms, people like to bring food and drinks to enjoy a picnic. Some of the common cherry blossom viewing foods include:

- Sakura Sake: Sakura blossoms are infused in sake to give an alcoholic flavor.

- Sakura Senbei: thin cookies flavored with cherry blossoms, sometimes with cherry blossom petals.

- Sakura Wagashi: Traditional Japanese desserts, often in the shape or flavor of cherry blossoms.

These customs and foods are designed to add to the fun and celebratory atmosphere of cherry blossom viewing while enjoying the cherry blossoms. Cherry blossom viewing is an important part of Japanese culture and attracts many people to enjoy and experience.