You should definitely try north east of India that is Assam it's one of the best visiting place across India. you'll enjoy the nature hills and many more. I'll be traveling there next week. so I share in brief
For Assam you have the following places to visit -
Day 1 - Guwahati
Day 2 - Chandubi Lake
Day 3 - Manas National Park Day 4 - Reach Jorhat
Day 5 - Majuli Island
Day 6 - Dibrugarh, Shivsagar and Tinsukia
Day 7,8 - Kaziranga National Park Day 9 - Tezpur, Nameri National Park
Day 10 - Bhalukpong ( Entry point of Arunachal Pradesh)
In Assam there are many beautiful places to visit, the main entrance gate - Guwahati City which is the heart of entire North East.. Apart from that Barpeta, Hajo, Kaziranga National Park, Jorhat, Majuli, Sivsagar, Jatinga, Haflong nd many more are there.. In Arunachal Pradesh u can visit Tawang, Menchuka, Ziro, Tezu, Mayodia, Hunli nd many more.. Many of the place in AP are in remote areas so u should have proper knowledge before visiting..