Bela, Taj Mahal is in Agra, she has already mentioned Agra :)

Neli, since all the places mentioned by you are historical, I suggest you to have some fun of wild life. Try to visit one of the famous Tiger Reserve in India, Jim Corbett National Park. And being in Delhi you can squeeze in a half day trip to Bharatpur Bird Sanctuary which is quite close to Delhi. You can plan like Delhi-> Bharatpur ->Jim Corbett-> Agra -> Jaipur-> Jodhpur-> Goa

OR

Delhi-> Bharatpur -> Agra ->Jim Corbett->  Jaipur-> Jodhpur-> Goa

PS: Only if you have interest in wild life. Otherwise visit Ajanta/Ellora caves!

*Belal!

I am sorry to have misspelled your name! It was a typing error.

Try the Indian Food. Although, I believe they just call it "food" there.

  I know a woman who has been to several missionary trips to India.

     She informed me that she will never travel anywhere in   India  without a man, 

since women  doing anything alone are usually targeted for rape.

You can visit Ajmer Sharif. Ajmer is tomb of a Sufi Saint who lived in 12th century.