Each island in GPO offers certain items that you can acquire. Here's a list of some notable items found on various islands: 1. Arlong Park: Kiribachi (5% drop rate) 2. Fishman Island: Fishman Karate techniques 3. Shell's Town: Metal Jaw (25% drop rate) 4. Desert Island: Eternal Pose, Karoo Mount, Karoo Food 5. Sky Castle: Guardian's Helmet (5%), Skyblue Katana (5%)