A group of American surfer imbeciles go to an out-of-the-way beach in Mexico and get harassed by unseen rat people. It's sub-inferior material, but well enough exploited to sit through.
The horrible camera and lighting work (the excess of the movie, and all of the action, was too dark and characterized by a heavy dimness or obscurity, rather than bringing any atmosphere or tension, it was just irritating - literally, often you cannot see what's going on).
The scary scenes were remarkable in having no bloodshed, too fast and murky editing, and the acting, lousy.
I will say, I think it would have worked better as a 30 minute movie, because the story is downright empty-headed, like someone made it up in about 1 day.