People are taking sun bath on the boats!!! Actually they are waiting for the rest of the people who are returning from their work. Expecting people are their traveling partners from their village. They are day labourer. They come to city all together and return to village with all. So that they can save some money. They wait all day until their partners returned from work. They use boats for traveling because Bangladesh is a country of rivers and it's very cheap of cost to travel through river.