Fodor's Expert Review Roatán Institute of Deepsea Exploration

For a pricey but one-of-a-kind experience, contact Stanley Submarines for the ultimate deep-sea wildlife-viewing excursion. The two-passenger submarine, named Idabel, is piloted by Captain Karl and expeditions take you as low as 610 meters (2,000 feet) below sea level. The journey promises the chance to spot sharks and mysterious creatures you've likely never imagined. It's reservations only so be sure to book in advance.