The Ganges River is so well known a body of water that it hardly even needs introduction: the transboundary river that Bangladesh shares with its neighbor, India, this enormous waterway empties a truly prodigious volume of water into the Bay of Bengal each year, putting it well into the top 10 river systems of the world in terms of average discharge. The Ganges is significant not just in terms of size, although one might argue that size is the root of its cultural importance as well. Given that it irrigates as well as inundates such a huge expanse of land, it has carved a place for itself permanently into the local peoples, both those of India and of Bangladesh.
The Ganges in Bangladesh is typically identified with the branches of the Padma, the Meghna and Shitalakhma, which are usually the rivers named for various cruise options in the country. River cruising is popular here, and more than a few companies operate cruises daily or close to it, providing amenities such as food and drink to last the trip. Different cruises have different stopovers or attractions, and which cruise you do end up picking is dependent on what it is that you want to see (or how long you want to stay in the river).
Usually, companies provide a list of which attractions shall be seen during each cruise. With a little bit of knowhow about the geography and location of tourist sites, though, you should be able to guess it for yourself. For instance, if the cruise says it is going to be taking the Shitalkhma route, you can expect to see Zamindar’s Palace as well as Noapara. Should the cruise list Meghna as the river of choice instead, you can expect to be shown the original capital of the country, Sonargaon. Basically, you can just follow the routes they are indicating on a map and see if the plan suits you.
Keep in mind as well that different tours have different durations. For most travellers, the shortest cruises are preferable, as they do not desire to be stuck on the steamer for days at a time. Most of the short cruises run from 9:00hrs to around 15:00hrs of the same day and should satisfy most people. Those more comfortable with being on a boat can take longer trips that can reveal more of the country’s attractions, though, such as those provided by Holiday Tours & Travels, which offers whole-day trips. There is also the famous Rocket Steamer of Bangladesh Expeditions: this is very popular because it goes all the way to the Sundarbans (a famous attraction of the country) and lasts for four days. It all depends on what you want and how comfortable you are with staying for extended periods of time on the Ganges River. Take note that local food is typically provided with all cruises, although some have better food than others: the general rule is that the more expensive the fare is, the better the cuisine shall be.