It's a couple of group of teenagers who spend a weekend on an island, the place supernatural occasions start to happen. (skilledgeekz.com)
Brooklyn Gang (group of teenagers in restaurant), 1959 8 5/8 X 13 inches Gelatin silver print; printed no later than 1962 (howardgreenberg.com)
And John Carpenter's 1982 The Thing, which - although never mentioned in the movie itself - was a huge influence, especially when the small group of teenagers start to mistrust one another. (scifimoviepage.com)