The Mutant Python 2

In Southeast Asia, with its gorgeous scenery, a cruiser with many tourists on it enters into mystical waters, in which there is a huge mutant. People mysteriously die one after another. The "killer" in the dark and the mysterious person among the tourists make the cruiser "an execution machine." Survivors who flee to a weird uninhabited island meet a fiercer mutant, and start a journey of survival.
(Source: TMDB)