A Perfect Getaway (2009) on Netflix

Newlywed Hollywood Screenwriter Cliff Anderson and his wife, Cydney, head off to Hawaii for their honey-moon. After obtaining permits they drive a rented car and encounter hostile hitch-hikers, Cleo and Kale. They subsequently come to find out that police have discovered a brutally murdered couple with their teeth and nails removed. Cliff and Cydney then encounter war-vet Nick and his girlfriend, Gina, and together the four trek their way towards a popular beach. It will not take them long to realize that both Nick and Gina are a little odd, but before they could decide to separate from them, they find themselves confronted by Kale and Cleo, as well as unknown stalkers.