To not seem as fixated by the River as I am, let me mention that Guwahati has other places and things too....
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The first thing you have remember for going to Arunachal Pradesh is to get yourself an inner line permit issued from the government of Arunachal Pradesh. You can either directly apply for it from their offices at Kolkata or Guwahati or take help from some travel agent. In my case, all the hotel bookings,the car booking and the inner line permit issuance was done by a travel agent based out of Kolkata. The name and details of this travel agent are mentioned below:http://www.wandervogeladventures.com/