Also please keep in mind that Sundarbans is a plastic free zone. Please do not throw used/unused plastic into this environment. Keep them with you or in a waste basket. There is a relentless effort of making this beautiful place clean, please help to achieve it by not dumping garbage all around.
The Sundarbans are the largest littoral mangrove belt in the world, stretching 80km (50mi) into the Bangladeshi and Indian hinterland from the coast. The Sundarbans has been declared a UNESCO World Heritage Site. The part of the forest within Indian territory is called Sundarbans National Park. The forests aren't just mangrove swamps though — they include some of the last remaining stands of the mighty jungles which once covered the Gangetic plain. The Sundarbans cover an area of 3,850 sq km, of which about one-third is covered in water/marsh areas. Since 1966 the Sundarbans have been a wildlife sanctuary, and it is estimated that there are now 400 Royal Bengal tigers and about 30,000 spotted deer in the area.
The forest is called 'Sunderban'due to the rich growth of Sundari trees.
Flora and fauna
Royal Bengal tiger, saltwater crocodiles, deer, birds, bull sharks, various primates and snakes.
October to February — winter, cold and temperate
March to May — summer, hot and humid
June to September — the monsoon season, wet and windy
Monsoon cruises are spectacular simply because of two reasons:
1. The movement of boats is less since a lot of people avoid that time because of the season. However, the positive is that chances of sighting wildlife is more.
2. The cloudy sky and the lovely sunset is the best time for photography.
Sundarbans National Park is located in the south eastern fringe of the Indian state of West Bengal and part of Sundarbans Reserve Forest. The adjacent inhabited areas of the Indian part of Sundarban are well connected with Kolkata by both roads and railways. And Kolkata is well connected with big cities in India by road, rail and air. Kolkata is also connected with Bangkok, Singapore, Hongkong,Kathmandu, Dhaka etc. by air.
Places connected with Kolkata and from where a motor boat take you to Sundarban National Park:
Godkhali Port located just opposite of Gosaba Island and Gosaba is the last inhabited islands towards Sajnekhali Wild life sanctuary and Sundarban Tiger project area of Sundarban reserve forest. The shortest route distance to Godkhali port from Kolkata is 82km and 95km from Kolkata airport (Netaji Subhas Chandra Bose International Airport). Gorkhali is reached by road from Canning.
Koikhali is nearer to the Haliday wildlife sanctuary and tourist attractions like Bonnie camp, Kalas Island and beach, Haliday Island etc. Koikhali is 83 and 92km away from Kolkata and Kolkata airport respectively.
Namkhana is 117km away from Kolkata and 123km from Kolkata Airport. Namkhana is also connected with railway from Kolkata and the distance is 109km. This place is closer to Bhagabatpur crocodile project and Lothian wildlife sanctuary of Sundarban.
Canning is the nearest rail head to Sundarban Tiger Reserve. Railway distance from Kolkata to Canning is 45km and 29km away from Godkhali Port. It takes 1h20 to reach Canning station from Sealdah station in Kolkata. Public transport is available between Canning and Godkhali port. You can reserve a vehicle (Tata Magic) directly to Godkhali from Canning for ₹600-700 per vehicle (Feb 2014). In case a direct vehicle is not available, you can reach Godkhali via Sonakhali. There are bus and auto rickshaw services from Canning to Sonakhali and Sonakhli to Godkhali. For more details visit the link: 
Foreigners wishing to visit the Sundarbans have to obtain a special permit. This is mandatory as per Government rules. It can now,however be obtained at the Sajnekhali Forest Office(Ecotourism Range) .The originals have to be shown to the forest office on your arrival.
Tourism Centre, West Bengal Tourism Development Corporation Limited, 3/2-BBD Bag (Near Great Eastern Hotel), Kolkata. ☎+91 33 2210-3199, +91 33 2248-8271.
A permit for maximum 5 days is usually granted which can be further extended subject to the permission of local forest officer.
Must see places to visit when you are in the Sundarbans:
Sajnekhali Watch Tower
Dobanki Watch Tower
Sudhanyakhali Watch tower
Neti Dhopani Watch Tower
Kumirmari Watch Tower
Jhingamari Watch tower
Bonnie camp Watch tower
Bhagabatpur Crocodile park
Chargheri Char - Mud Flats, a new and unique place in Sundarbans where you can feel the mudflats and do a few hours of jungle and coastal trek (in the mud as well as coast).
All these can be covered in varying lengths of time; in a 1N 2D package you may be able to cover 2 - 3 watch towers, in 2N 3D package you may be able to cover a few more and so on.
Apart from cruising around the tourism zone of National Park, take a village walk. Visit a local school.
Go on a cycle trip to the local village market. Know more about the unique Mangrove Eco System. *Join a fishing or crab catching expedition on a country boat around the village(you are not allowed to do that inside the Reserve Forest).
Take a birding walk around the village.
Join a cooking class,and learn how a local dish is prepared with simple local ingredients.
Experience a local cultural programme Bonobibi Yatra - a local rural theatre performed by the villagers.
Be sure that you have booked your lodging or trip package through a responsible tourism organisation that shares the tourism benefit with local communities, does not employ child labour, and practices environment-friendly tourism.
Organic Brown Rice.
Fresh Sea Fish. Prawn. Lobster. Dry Fish Curry. Cottage Cheese. Pan Cake. Rice Pudding (Bengali dessert).
Filtered or boiled water (do not insist on mineral water unless it is a part of your personal medication. Mineral water comes in plastic bottles. Sundarbans is a No-Plastic Zone.) Fresh coconut juice. Fresh watermelon juice. Mango juice.
WARNING: To avoid the unsavoury, corrupt, and thoroughly untrustworthy booking services based in Kolkata, it is best to get a place to stay on arrival without advance reservation.
Sunder Chital Tourist Lodge, Sajnekhali , belonging to West Bengal Tourism Development Corporation Ltd. 30 double bedrooms, ₹700 including breakfast+1 meal. Dormitory, ₹250 per bed including breakfast +1 meal. No air-con. It is the only lodge close to Sajnekhali Forest Beat Office and one can get the perfect jungle feeling.
Sunderban Tiger Camp, Dayapur Island, National Park East Range. City Office: 9, Mitter House, 71, Ganesh Chandra Avenue, Second Floor, Kolkata. ☎ +91 32 935749, +91 93 3109 2632, +91 98 3117 0453, Fax: +91 33 22252 6078, (email@example.com), . The only Star Classified Government Approved Luxury Forest Resort in West Bengal. In the heart of Sunderbans and amidst a sprawling 9 acres of forestland opposite Sajnekhali Tiger Reserve Forest. A boutique resort providing conference facilities and accommodations include tents, huts, and cottages, with air-con units available, all with attached baths. Meals served buffet-style with vegetarian options. Sightseeing tours by boat. The rooms have attached clean bathrooms with running cold water and hot water on request, and very well sanitised.
Houseboat in Sundarban, M.B India Beacons, Sajnekhali, Sundarban ☎ +91 33 2419 1976 ☎ +91 9903295920, An houseboat with 2 Rooms sufficient enough to accommodate 3 + 4 = 7 persons. Well furnished rooms, not cabins.A unique experience of cruising during the day and staying in the middle of the river at night.
The Sundarbans is the only place in the world where tigers still actively hunt humans for food and usually between 50 and 80 locals are mauled each year. The Royal Bengal Tiger is extremely dangerous in the Sundarbans, but most visitors need not worry since wildlife tours and accommodation that is provided by the state government will never put you in harms way; however if you are interested in private tour (by hiring a small machine boat or so), do it at your own risk! The Sundarbans is also home to a population of Saltwater Crocodiles (Crocodylus porosus) and Bullsharks are found throughout the estuaries, so swimming is not advised anywhere.