In fact, that was a special tour with a company so I didn't have to think by myself about transportation, where to eat, etc.

I really visited a lot of places, many temples, castles, gardens, I was at a tea ceremony, a traditional dinner with geisha dancing for us, went to the Tokyo Town Hall, Tokyo Tower, Shibuya and Shinjuku, I even went to see Mount Fuji by boat,...

In think, the most you prepare in advance, the most you will do and see.
But also get ready to have some rest when you come back to your place ! That was possible for me to do all these things but it also took some days to recover from this intensive trip :p

Was this a company trip? Or was this something you booked yourself through a touring company?

わあ、いいね〜みなの話を聞いたあと日本へ直ぐに行き たいなと思っていた。ごめん全部は日本語で書いていん だのでアイフォームの文字だけ使って出来ますから。

A tour with a touring company !

That was also a way to economize on food, transportation, etc. :)