Aqua is a great lounge/bar at The Park Hotel by the poolside.
The music is always good and the ambience is fabulous. Considering its open air though, the best time to visit is in winter.
Apart from Aqua, The Park Hotel also has a bar - Someplace Else - where they have live rock music every night.
Another club at the hotel worth visiting is Roxy.
All in all, The Park Hotel is a one stop destination for the best nightlife in Kolkata.

Shisha is another very popular night club of the city. Located on Camac Street, it is always buzzing! Another option for party- goers is Nocturne on Shakespeare Sarani.

If one is looking to just sit back, relax and have a couple of drinks,  then Junction (the bar at The Taj) is the place to go. Can be followed by a quick bite at the Hub (coffee shop at The Taj) which serves the best pizzas in town!