Hi Siri, For a relaxed and more enjoyable trip, I suggest to cover North India in a month, you can plan your trip around this route: Amritsar - Pathankot - Manali - Rohtang La - Chnadrataal - Kaza - Kibber - Tabo - Nako - Kalpa - Narkanda - Chandigarh - New Delhi. Alternatively you can cover North-East India and West Bengal or the entire south India - Hill stations of Munnar, Ooty, beaches in Pondicherry and Kerala backwaters.
A 30 days trip is not enough to see how incredible India is. Still you can do one thing. Visit Kerala,Ooty,Munnar,Chennai within the first 10 days then straight move to Himachal Pradesh to explore Spiti,Leh,Ladakh,Shimla,Kullu,Manali,Kalpa,etc(Northern Part).This will take you 15 days to cover some of it.Don't miss Jammu and Kashmir.Or visit Andaman first then the Southern part and then Jammu,Leh,etc.
I want it to be a 30 days holiday and I want to cover almost every part of India that is less popular but very interesting. I have seen all the important places in India.(Taj mahal, etc) And this time I intend to travel by air and once or twice go for a train ride. I live in Hyderabad