Island Trilogy (Gordon Korman)

Six teenagers on a court-ordered character-building sail out of Guam are shipwrecked in a Pacific storm and marooned on a deserted island with no adults and no way to call for help. Across three books — Shipwreck, Survival, and Escape — they scrape together food, shelter, and an uneasy peace among themselves, only to find the island is not as empty as it seemed, and that getting off it will be as dangerous as landing there.