Japan 11 Days

Hello,

I would like to ask for your advise on my plan itinerary in Japan. From February 25 2016, I will be staying for 11 days in Ageo Saitama and I plan to buy the 7 day pass ( or 14 days pass if you think it is necessary)

Thursday Day 1: Arrive early morning in Narita. Take train to Ageo Saitama.
Same day go to Yokohama for a half day visit. ( using JR Pass)

Friday Day 2: Ageo Saitaima- Hiroshima ( using JR pass)
Visit Hiroshima Peace Memorial From Hiroshima go to Osaka ( is it too short of time?)

Saturday Day 3: Osaka and return to Ageo Saitama evening

Sunday Day 4: Ageo Saitama- Kyoto- Ageo Saitama ( JR Pass)

Monday Day 5 : Ageo station- Fuji 5 lakes- Ageo Saitama (JR Pass)

Tuesday Day 6: (Not too sure where to visit. Any suggestions?)

Day 7/8/9/ : Ageo Saitama- Big Sight Tokyo ( attending seminar)
** For day 8/9 I plan to buy the daily unlimited tickets for JR Tokyo Wide Pass. I heard it would be 10,000 yen.

Saturday Day 10: ( Not too sure where to visit. Any suggestions?)

Sunday March 6 Day 11: Narita airport ( buy normal ticket)

Your recommendations on other places to vist and your advise on my plan itinerary is greatly appreciated.
Thank you,

Jeff