Thank you both Janvic and Daniel-san for your help!
I have the travel more or less defined, but since you are a Japan an JR expert, maybe you can give me your opinion about it.
I'll be around 3 weeks in Japan. I'm thinking about this route:
From Tokyo to
Mt Fuji sightseeing (1 nigth in the area Hakone or Kawaguchiko that you suggest)
then Nagoya (1night)
Nara and Koyasan (1 night in Koyasan)
Osaka (1 night)
Himeji Castle
Kyoto (3 nights)
and back to Tokyo
Then make some day trips around Tokyo like Nikko, Yokohama...
Do you think it is a good trip in terms of sequence and places to visit? Do you suggest any other place to visit?
What about day trips around Tokyo?
What do you think is the most recomended JR Pass to do that? 7 days will be enough in your opinion for the main trip?
Thank you so much in advance for your kind help!