Particularly the buses which are air conditioned and relatively new. Otherwise, local road travel is done by taxi or pickup truck. Both taxis and pickups are overcrowded and sitting in the bed of a pickup truck can be especially uncomfortable. Sitting is the cab of a pickup truck is a bit more expensive and a lot more comfortable than sitting in the bed. For sake of comfort and safety, consider buying more than one place in a taxi or pickup, which, if not allowing you to stretch out, at least assures you of not being packed in like so many sardines.
Train travel is slow and relatively uncomfortable as seating conditions are spartan at best.
The schedules are also unreliable and changed without notice so be prepared to change your plans accordingly. Trains are generally used by locals only though some intrepid travelers are beginning to experiment with this form of travel. Travel by boat is generally more reliable than trains and more comfortable than taxis or pickups. Not up to western safety standards. The prices listed below, especially for the taxis, may vary.