Don't go to Himachal, Uttarakhand, Rajasthan because of India-Pakistan disturbance, because all flights on those routes affected right now. you can go to South or East.
It all depends on your Mood, like what would you like to explore? For the Historic and Cultural trip you May Visit
Gujarat
Rajasthan For Some Sort of Adventure you can go to
Manali
Kullu
kasol
McLeodganj
Dharamsala
Rishikesh
Dal Housie If you want to go raw and explore the natural beauty you may go to
Assam
Orissa
Seven Sisters
Bhutan
Nepal or the Hill stations like
Chikaldhara
Coorg
Ooty
Mahabaleshwar
Lonavla
Lavasa If you're Interested in Safaris and Animals, you may go to
Jim Corbett National Park
Ranthambore National Park
Bandhavgarh Tiger Reserve
Gir National Park Since all of the National parks in India are usually closed from July to October. You can plan this as well.