The INS Vikrant museum has been thrown open to public at the Ballard Pier (Tiger Gate), till the 2nd of December. This is as part of the Navy Day celebrations, which happens on 4th December. I've never been in an air-craft carrier before (who does these days eh), so it was pretty novel. Lots of interesting stuff about India's maritime prowess. It would have been better if there had been a guide to show us around. Curiously, they allow cameras on-board but not mobile phones... wonder why!
The Monetary Museum is located behind the RBI building at Fort, right opposite the entrance of the road leading to the Ballard Pier. The best maintained museum I've seen till date, sporting motion-detecting doors and closed circuit cameras covering a collection that is sure to be a numismatist's delight; and a very well explained display, depicting the origin and development of money. The Indian coin collection is unparalleled - with coins of almost every era explained in great detail. A must visit. Sadly, the open timings are between 9am and 5pm and it's shut down on bank holidays.