How great is that! I think often the Mumbai trip is merely an excuse to take you off for the day somewhere else, like the Taj Mahal. The downtown tourist part of Mumbai itself is quite beautiful, in its way, with some interesting sites. You'll have to wait and see what the ship offers, then perhaps people who have been there can give you some ideas. I was in Mumbai for a week on business, and only got to see the tourist part of Mumbai for one evening, so I am no expert.