It sounds like a plan. I would suggest adding a stop at Tezpur on your first day. The four-hour drive across 165kms lets you spend more time en route at the Orang National Park (Tel: 03713 230022). The small 79 sq km park is rich in wildlife. Stop for the night at Tezpur, where the Brahmaputra is calm and wide. The town has some beautiful parks, including Agnigarh and the charming Chitralekha Udyan. For stay, try Hotel KRC Palace (from Rs 3,100) or Hotel KF (from Rs 2,700).
The following day, head to Nameri National Park, which is an hour away. Nameri is full of bamboo thickets and open grasslands along the river Jia Bhoroli and its tributaries. It has a large elephant population. Do keep an eye out for the endangered white-winged wood duck. The Jia Bhoroli is famous for an abundance of golden mahseer, a favourite among anglers. For stay, there is the excellent Nameri Eco Camp (from Rs 2,945). Then make a 160km/4hrs drive to Dirang.
As you enter Arunachal Pradesh, the road turns scenic with hairpin bends and tropical rainforest flanking the winding road. At Bomdila, don’t miss the Gontse Gaden Rabgyeling Monastery. Stay options include Hotel Elysium (from Rs 1,500) and Hotel Siphiyang Phong (from Rs 1,200). Push on to the charming hill station of Dirang, with its 400-year-old hilltop fort, an orchid centre, apple orchards and views of the Kameng Valley. For stay, consider Hotel Pemaling (from Rs 1,600), or Norphel Retreat (from Rs 3,000). The journey from Dirang to Tawang is accomplished in about six hours, through the 4,215m Sela Pass, the highest motorable pass in the Northeast. The mighty Tawang fortressmonastery dominatesthe town and there are several other shrines in thevicinity. See tawangtourism.in for a comprehensive list of accommodation options