Hey Anwesha, You can follow this itinerary : Day1 - Take a bus from Chandigarh to Manali ( either State transport or Volvo ) Day 2&3&4 - Sightseeing and activities in Kullu-Manali Day5 - Manali to Amritsar Day6 - Amritsar sightseeing Day7 - Amritsar to Delhi to Dehradun Day8 & 9 - Dehradun sightseeing Day 10 - Dehradun to Jim Corbett Day11 - Corbett Safari and sightseeing Day12 &13 - Corbett to Nainital and Nainital sightseeing Happy travelling!!!!!!
Nainital,Jim corbett, dehradun will take 5 days.
Amritsar will take 1-2 days.
It will be tough/hectic to cover these in 8 days.
Rather than cover himachal with amritsar.
U need to choose either himachals or uttarakhand as u would need more days to cover everythibg in 1 go..if ur taking uttarakhand u may start from nainital - jim corbett-rishikesh-dehradun-mussoorie.
And if u choose to go to himachals start from shimla-kullu-manali-dalhousie-chandigarh-amritsar.