Some of these pictures and descriptions may give away plot details that you might not want to know before watching the film.
This is a horror/comedy, one of several made in the 1980s based on holidays or other special days after Halloween became a hit. It's better than most and interesting because of its big twist ending which I won't spoil here. But don't see it just for the snake scene. It's forgettable.
The basic premise is that a young woman invites her college friends to her isolated house on an island where one by one they start getting murdered. After one of the men goes missing they go outside to search for him. One man is searching for him in the woods where he walks next to a snake. Then he gets his foot trapped in a noose right next to the snake and becomes suspended upside down above the snake. The snake strikes at him several times, and it looks like it strikes him, but nobody ever mentions that he was bitten except at the end when the woman who invited her friends mentions that the snake was not a part of her prank that captured the man in the noose. After the snake strikes, we see the feet of someone kick the snake out of the way and then we learn that the suspended guy was murdered. So apparently the snake was just there by accident. The snake is not a snake native to the U.S.A. It's hard to see, but it might be some kind of harmless South or Central American tree boa.