[samurai007]

I spent 1 1/2 days seeing Hiroshima and Miyajima, not including Okayama. Personally, I'd make it 2 days if you really want to spend time seeing the places rather than running between them. Also, staying on Miyajima itself can be expensive and it's frequently booked up. Do you already have rooms reserved? I stayed in Hiroshima instead, plenty of cheaper places to stay there.