BurbleChaz

Hamilton Island is, of course, the Secret Island Hideaway for an Evil Criminal Mastermind. The Hidden Missile Silo is inside Passage Peak

There are henchmen everywhere, masquerading as tourists. You can tell their true nature from the transport they use: My mission is to locate the Evil Mastermind, get them to reveal their dastardly plan, steal their cat and make good my escape by mini-submarine. Or I could have a beer instead.