Boating in the Hooghly. There is no jettyYou get jetty only in Dakshineswar temple ghat and Belur, you can enjoy a 20-30 minutes boating ride from Dakshineswar temple to Belur Math.
Sunset on the Hooghly river behind the Vivekananda Setu [Vivekananda Bridge] from the bank is superb. In winter you will enjoy the most with the set of dusk and chill wind blowing over your body.