The Mumbai By Night tour that Reality Tours and Travel runs is a good way to see lots of scenic spots that are particularly lovely at night. It includes Marine Drive at dusk, very popular with couples, Chowpatty Beach if you missed Reality’s Street Food Tour, as well as the great view from the Hanging Gardens, wealthy Malabar Hill ( with its 27 floor 2 billion dollar house, for just five people… and their 200 staff), busy Bendhi Bazaar and Mohammed Ali Road and Victoria Station.
About $Aus 18 per person, travelling from point to point by car (nice at the end of a full day), for around 2.5 hours.