Bakkhali Experience: Bakkhali is 3 hrs drive from Kolkata (excluding the time to cross the river by big boat). You must watch the sunrise at beach & sunset at Henry island. And must go to Jammu Island. It is 45m-1hr journey from Bakkhali via boat. It is a clean & calm island. Lovely spot.
Food, sight-seeing and shopping: Stay at Hotel Deepak. You'll get a lot of options for food. Sight seeing is Henry Island and Jammu Island.
Activities & things to do: Just chill out in the beach and island.
Travel tips, How to reach, travel warnings etc: You can go by car. Or, bus services are available upto Bakkhali. By train you can reach upto Namkhana. Then you need to cross the river & you'll get something to reach Bakkhali..