You may hire guides or reserve activities at a travel desk in your own country. Why not to try online reservation directly to agencies in Japan?
Here are some companies those are providing multi language information and online reservation service for you.
Wanna Trip is an online reservation platform for tours and activities, services provided by Adventure.,Inc.
Support language: English, 中文简体, 中文繁體, 한국어, ภาษาไทย etc total 18 languages
The provider of JAPANiCAN.com is a member of JTB group, one of the largest & the most popular tourism organisation in Japan. It provides you online booking service for not only hotels but also tours, and more all across Japan.
Support language: English, 中文简体, 中文繁體, 한국어, ภาษาไทย.
Another major travel agency Hankyu Travel provides their tours for foreign visitors.
Support language: English, 中文简体, 中文繁體, ภาษาไทย