Hi, Suman!
Yes, March and April are best months to explore Arunachal. You can check out the following link to check out the best suitable itinerary: https://www.tripoto.com/tour-packages
Hi Suman Have a look at this write up. It might be of interest for you Arunachal Pradesh : The Land of the Dawn-lit Mountains
https://tripoto.page.link/HoxT