Island Fury (aka Please Don't Eat The Babies)(1983) part 1 of 4

http://www.imdb.com/title/tt0086119/ ISLAND FURY tells of two self-assured young women, brilliantly named Sugar (Elizabeth Monet) and Bobbylee (Tanya Louise). Sugar wears a gold coin around her neck, and since it apparently can lead to the whereabouts of some hidden treasure. The girls are persecuted in an exotic town by some greasy thugs (one of them is named “Repo”) and after running past the same area three times and steamrolling into a number of hapless shoppers, they are caught and given the expected threats. The thugs force the girls to a nearby island and make them recall the story of how they found the gold piece. This results in a flashback story which has them together at age ten, hanging out with two teen girls in bikinis and two teen guys in speedos, and how they played “cat and mouse” with a family of backwoods psychotics living reclusively on the island.