It's cool to have a Shingon Buddhist here. I think it's amazing that other Vajrayana traditions still exist besides the Tibetan ones. I'd like to read some of Kukai's writings sometime. I practice Kagyu Tibetan Buddhism, so I consider Shingon Buddhists to be my Vajrayana brothers and sisters.
Maybe if you make enough noise in the Shingon section, Ven. Eijo might even come and post here.
If I ever visit Japan, seeing Koyasan is my priority!