23 day itinerary in Aug-Sep

Hi there

My husband and I are planning a trip to Japan in Aug/Sept 2014. We are both avid travellers and will be staying in a mix of business hotels, ryokan and guest houses.

This is our current itinerary:

26 Aug: Sydney -- Tokyo
27 Aug: Tokyo
28 Aug: Tokyo (Disney)
29 Aug: Tokyo -- Nikko
30 Aug: Nikko -- Hakone
31 Aug: Hakone
1 Sept: Hakone -- Takayama
2 Sept: Takayama
3 Sept: Takayama -- Kanazawa
4 Sept: Kanazawa (Shirakawago)
5 Sept: Kanazawa -- Kyoto
6 Sept: Kyoto
7 Sept: Kyoto (Nara)
8 Sept: Kyoto
9 Sept: Kyoto -- Hiroshima
10 Sept: Hiroshina -- Miyajima
11 Sept: Miyajima -- Osaka
12 Sept: Osaka
13 Sept: Osaka -- Mt Koya
14 Sept: Mt Koya -- Tokyo
15 Sept: Tokyo
16 Sept: Tokyo
17 Sept: Tokyo (Sumo)
18 Sept: Tokyo -- Sydney

We are wondering the following:

1. Are we trying to see too much?

2. If we are doing too much travelling, what would you change? Should we skip a certain place, or adjust the length of time we are staying somewhere? We have booked our time in Kyoto, but everything else can be moved.

3. We are planning on getting the 21 days rail pass. When should we activate this?

Thanks you for your help!!!