this be a great 1981 film which have a great story about three men and two girl who go on a camping trip together and go through thick wood and high mountain with a great water fall . this group of people run into property own by george kennedy and ( roy mclean ) who play the role a a forest ranger and rid a white horse . roy mclean warn these young people that where they be go be no area for camp and they should turn back . of course these young people pay no attention and proceed to have a ball swimming in the nude near the water fall and playing great music and dancing by the fire and have plenty of beer and wine . there be an old wooden one room school house that draw the gal and guy inside and it be from that point on the film start to get very scary . there be one occasion when a young girl have to climb a tree in order to get away from a human beast who desire her body and start chop the tree down in order to capture her . don not miss this film and there be plenty of everything .