I caught a moment of this flick on cable and was intrigued. After checking out the positive reviews here I recorded it on my DVR to watch in its entirety later.
The movie does draw you in at the beginning, with the standard "sailors beached on a desolate isle." They soon realize that strange things are afoot here, and we are given to understand that supernatural events are transpiring.
However, the movie then loses its forward motion. You can only have so many ghostly appearances, frightening nighttime walks in the woods, and otherworldy voices singing before your attention starts to flag. The movie lacks the arc of suspenseful tension that you find in Hitchcock's movies. By the long-hoped-for end one is yawning.
Skip it and watch reruns of Gilligan's Island.