India is a vast country.
Do let us know which parts you plan to visit.

That would be nice, we are planning to visit Delhi, Mombai, Bangalore is being reviewed.
Any suggestions? we have like 7 days max.
If you are looking for history / ancient monuments, Delhi with a short trip to Agra should be fine.
Do try and squeeze in Bangalore into your trip, since it is the IT capital of India.