Survival Island (2005)

Jack & Jennifer take a private cruise with friends, such as Captain Richards and his wife Maggie. Manuel is a staff member who catches Jen's eye. Thanks to chain of events sparked off between a dispute concerning Jack and Manuel, a fire breaks out and the ship blows up and sinks. Jen and Mannuel seem to be the only survivors to wash up on an island...but before long Jack shows lying in a rock pool...and here's where the tale turns nasty