Kansai - Okayama - Kinosaki - Amanohashidate - Miyama - Kyoto - Osaka

Hi,

My wife and I are planning our 12 nights Kansai trip, could you help me check if my itinerary make sense and economical in transports? If the itinerary is okay, what is the best rail pass to use? We were looking at Kansai - Hiroshima Area Pass and Kansai Wide Area Pass, should we get both or any other suggestions?

12-Feb-16 Arrived in Kansai aiport at 6pm - Okayama (stay in Osaka and only go to Okayama next morning?)
13-Feb-16 Okayama - Himeji - Kurashiki (day trip) and Seto Oohashi bridge (Marine Line night view)
14-Feb-16 Okayama - Hiroshima - Miyajima Island
15-Feb-16 Okayama - Kinosaki Onsen
16-Feb-16 Kinosaki Onsen - Amanoshidate
17-Feb-16 Amanoshidate - Sonobe - Miyama (bus) - should we stay overnight in Miyama or straight back to Kyoto?
18-Feb-16 Miyama (bus) - Sonobe - Kyoto (?)
19-Feb-16 Kyoto
20-Feb-16 Kyoto
21-Feb-16 Kyoto - Nara day trip
22-Feb-16 Osaka - Kobe and Koya san day trip?
23-Feb-16 Osaka - explore Osaka, food & shopping
24-Feb-16 Osaka - 1/2 day - Kansai Airport - Fly home night flight

Is there luggage locker around Sonobe train station?

Thank you very much for your advice!

Regards,
Budi