The rv river kwai the first inland cruise ship in thailand is a newly built colonial style river cruiser based on designs used by the original irrawaddy flotilla which was founded in burma in 1865 and by the 1920s was the largest privately owned fleet of ships in the world the rv river kwai carries a maximum of 20 passengers in 10 teakwood cabins single deck and operates on a 4 days3 nights year round program every monday thursday