I'd agree with reading a guidebook.
Anyway,if you are going back to Tokyo....I'd have a look at Hiroshima after Kyoto.2 nights there for Miyajima too.Then train via Kanazawa and across the J Alps from there.You could fit in a day or two in Takayama like that,if you want to...
Then back to Tokyo.That's fast but doable in 2 weeks.
