They will see what they want to see their guide, they will enjoy what they want to guide them to enjoy. Then they'll just come back. This group is great for historical sites or monuments to see and not so good for the echo tourism. There is another group of visitors do better for ecotourism or relaxing holiday. This group has the imagination, are curious and want everything their own business.
Bangladesh will not be a good place for it. At least there is nothing special in this regard and the same as elsewhere. Other places may have better facilities. I would also like to welcome the second group, who want to know. Bangladesh Tourism can make their visit, the visit of a lifetime. However, you should plan appropriately, the places you will visit. For example, the largest mangrove forest with hundreds of streams supported by various types of wildlife. Just stretch your imagination to know the beauty of the place.