When people I know say that they didn't think that TBWP was scary, my first question to them is: 'Have you ever camped out in the woods?' Usually the answer is 'No." and I tell them that's why it doesn't scare them, that they don't know what it's like to be out there in the dark with nothing but the campfire and tent......
There is a decent movie out called "Backcountry" about an annoying yuppie couple who go on a camping trip, get lost in the woods, and eventually have a nasty encounter with a bear. There is a real creepy scene shot completely in their tent for several minutes where they hear all sorts of sounds from the outside at night. Pretty scary stuff even though the movie is not a great one.