Hi Anwesha ! Here is an awesome article answering your exact question. All the details you need are mentioned here. Https://www.treebo.com/blog/weekend-getaways-from-kolkata/ Hope this will be of little help to you. Happy Traveling.
Hi!
from Kolkata, u can ahead towards south fr vizag, Vijayawada,tirupati, or Hyderabad, or Chennai n bangalore Mysore, Goa n dhudsagar, hampi n hospet...
For a 2,3 days getaway from kolkata the best option would be sundervan, you can explore the place, its beautiful, peaceful and worth an experience.
Other best places could be 'bakkhali' just 4hr ride from kolkata, if you go bakkhali, you must explore henry island, you can also stay there by booking in advance. Or mandarmani and digha are also options.