Sugarcane Island

From the back cover: You're Trapped In A Deadly Paradise! You're on a ship headed for an expedition on the Galapagos Islands. Suddenly a tidal wave sweeps you off the deck and onto the beach of a strange tropical island. You're searching for help when you fall into a deep animal pit. At last some islanders haul you out. "Is this friend?" asks one. "No," the other one snarls. "This is enemy!"