21 day pass

Hi. We will be in Japan for 26 days and wondering if a 21 day pass will be worthwhile.
Tokyo to kamakurra and return
Tokyo to Nikko and return
Tokyo to takayama
Takayama to kyoto
Kyoto to Nara and return
Kyoto to ugi and return
Kyoto to himeja and return
Kyoto to Hiroshima
Hiroshima to miyajima and return
Hiroshima to Osaka
Osaka to Kobe and return.
If we also travel using jr buses etc would this be feasible.
Thank you for your time