2 weeks in Japan

Hello all,

I'm going to be traveling to Japan this June for 2 weeks.
I've been there twice already (once for an entire year) but never had the opportunity to go with a JR Rail pass as I was a student back then and was unable to travel a whole lot.

Here's my tentative itinerary:

Tokyo/Kawasaki: days 1-3
Takayama: day 4
Kanazawa: day 5
Fukui: day 6
Osaka: day 7-8
Hiroshima: day 9-10
Fukuoka or Kumamoto: day 11-12
back to Tokyo: dat 12-14

Does this itinerary seem sensible? Ideally I'd also like to spend a few days in Okinawa as I've never been there and could really do with some time on the beach. Would you sacrifice any of the aforementioned places over Okinawa? (Note: Tokyo/Kawasaki and Osaka are musts for me this time round.)

Thanks!