I'm thinking of a movie, possibly made-for-TV (although I may have seen it on HBO?), from the 80s-90s. There were a bunch of people stranded on an island, perhaps due to a shipwreck. The image that I remember most clearly is a long sequence in which a kid drowns because he gets his foot stuck under a rock and can't get it out before the tide comes up. I believe bags of drugs (maybe cocaine or heroin) were washed up on the beach from a shipwreck. The group is at one point threatened by a wild boar. Anyone? My deepest gratitude in advance.