There was this movie in the 70's (not in theaters) where a bunch of people 'win' a trip to this beautiful island. All is perfect! Then little by little things go bad; they lose electricity, the food goes bad, etc. Then you start to learn that all the guests of the island 'won' this trip and everyone has done some major sin or crime. It ends up that they are all in Hell. Any suggestions?

Possibly Haunts of the Very Rich (http://www.imdb.com/title/tt0068682/)