The guide will provides you with a blueprint of travel destination. The style of travel according to the guide is also a great reference for suggested tourist places.
Sundarban-The Greatest Wonder

Khulna division is in the southwest part of Bangladesh has an area of 22274 sq. km and a population of 14.47 million. There are 10 districts and 28 municipalities under Khulna. It has the world’s biggest mangrove forest, the Sundarbans. In Khulna town you can visit Khulna Museum and Zoo.
There are about 120 species of fish in the region and over a hundred species of birds. The forest is named Sundarbans after the beautiful tree. The only way to get to the Sundarbans is by boat. Winter is the best time to go.
Rangamati, Bandarban

Chittagong Division is located at southern part of the country has an area of 33771 sq. km and a population of 23.99. It has 11 districts and 38 municipalities.
Chittagong is the biggest seaport and second largest town in Bangladesh situated near the Bay of Bengal. It is 264 km away east of Dhaka, famous for hill areas, natural beauty and for the seashore. Chittagong is also known of the town of Aulias(Muslimsaints)Bangladesh.