It was during my initial years of work when I was at Kolkata that me and my friends stumbled upon this site : http://www.ecotourism.co.in/
West bengal has a lot that still lies unexplored. As a kid, I like so many others had devoted one chapter of geography on the only mangrove forests of India and the famous Sundari trees. Sunderbans is about a hundred kilometres from Science City ( tourism buses will pick you up from here.)
Travel/Stay/Food: We booked a package tour of 1 night 2 days from Eco Tourism. It cost us 2700 INR in 2010. We were picked up from Science City, given breakfast and packed water. After travelling about a hundred kilometers in bus we arrived at Gadkhali. From here we got into a motor driven boat, locally known as launch. The boat took us to the beautiful resort of pakhiralaya. It's all green around and we got beautiful clean rooms. Lunch comprised of rice and fish curry.
Dinner was at the resort too. The tourism arranges for a local group of actors performing a play ( also known as jatra) on Banadevi.
Day 2 lunch happens at the boat, as that entire day is spent in boat going from one island to another.