Travel advice - India

I know this is WAY off topic, but I wanted the advice of so many experienced travellers.  I've just been told that I'm heading to India for work and I'm going to take a week for myself after the job there is over.  I'll be Mumbai but travelling home through Delhi.

Any "must see" sites in such a short time...besides the Taj Mahal?

Gudi Padva festival is held March/April depending on the Hindu calendar - might be worth checking out to see if you are there at the right time.

The classic itinerary for the short-term tourist in India is Delhi-Agra-Jaipur.

It's quite interesting, as Jaipur is quite a cool place in itself.

If you can possibly do it, though, try to head out to one of the better places in Rajasthan province, like the lush Pushkar