12D11N Japan Itinerary

Hi all,

My friend and I (2 ladies, non-Japanese-speakers) are arriving in Tokyo on 1 May 11 am and departing 12 May 12 pm, would like to check if the following itinerary outline will work out.

We are taking into account the travelling time as well and are considering to get the JR Pass. We realize we will be arriving in the midst of the Golden Week, so would it be better if we traveled out of Tokyo upon arrival?

Tokyo > Hiroshima (2 days)

Hiroshima > Osaka (2 days)

Osaka > Hokkaido (3 days)

Hokkaido > Tokyo (4 days)

On the side, I am also keen to head over to Toyama Bay which seems a little out of the way on the map, and also the Ninja Mansion in Iga. Would we be able to get there using just the JR Pass? or would we have to purchase other tickets to get there?

Would like to check if in general such an itinerary will work out or is it too ambitious taking into account we are arriving in the midst of the Golden Week?

Any help will be much appreciated! And apologies if I'm not being very detailed in my question as we haven't gone into the details of where exactly we want to go.