Ngaire, sounds lovely. It's now five years since was in Mumbai (not a very pleasant visit), and I am ready to go back again, but would definitely travel first class. Kerala definitely attracts, and Goa.
As for clothing, if you have any time to shop, think about getting a salwar kameez. That is the less formal garb that the women wear--tunic, loose pants, and a long scarf (dupati.) I finally got one from one of my Indian engineers as a gift, and I intend to wear it on formal night in June.