tenga valley is all about army camps.
One can stay at any hotel in bomdilla[a village] or at tenga valley for night stay.
you can stay in tents also at bomdila. but be prepared with the winter wear. temp is not that low but the cold winds will blow you up :-).
Gowahati -> tenga/ bomdilla, roads are good
From tenga onwards, roads are narrow. As someone has said, destination is not important but journey towards the destination is what matters.
As soon as you enter arunachal pradesh from bhalukpong[last village on assam -AP border],you will see amazing unexplored Arunachal pradesh.
tenga valley/ bomdilla night stay.
Best Time To Visit
Best time to visit Tenga Valley is from April to June and from September to October