20 days in Japan!

Hi! Thanks a lot for helping us all! I would like to ask you about an itinerary I've arranged.
I have fixed most of the days, but the last days of my stay in Japon are not decided yet.

6 april Avión Tokio Tokio
7 april Tokio Kamakura Tokio
8 april Tokio Nikko Tokio
9 april Tokio Tokio Hakone
10 april Hakone Hakone Kioto
11 april Kioto Kioto Kioto
12 april Kioto Kioto Kioto
13 april Kioto Kioto Hiroshima
14 april Hiroshima Miyajima Miyajima
15 april Miyajima Miyajima Osaka
16 april Osaka Koyasan Koyasan
17 april Koyasan Nara Kioto

Where to go from 18 to 25th april (plane from Tokio in the evening)? I think one more day in Kioto and 3 days in Tokio would do, but what about the rest?

Thanks!
German