When preparing a schedule for you to come to Japan, you ｗould be better to be aware of long holidays such as the Japanese golden week, Obon festival, New Year holiday.
In addition, recently there are quite a lot of travelers from China to Japan. Especially when you visit Japan in a period of China's long vacation, sightseeing spots are so crowded with quite many Chinese people.
If you can re-schedule your vacation and avoid such a period of the Chinese festival, you would be comfortable there.
This year (2018), the Chinese Spring Festival(New Year Celebration) starts on February 15 and ends on February 22. Actually, it is thought that it starts February 11th.
2/15 Thu Last Day of 2017
2/16 Fri New Year Day 2018
2/21 Wed Holiday end