Over at Big Island adventurous vacationers can get aboard the Safari Explorer with just 36 others and, in between kayaking and dolphin spotting, engage in a mesmerizing ballet with manta rays.
9. Northwest Passage, North America —
For centuries, people died trying to get through the treacherous Northwest Passage. With changing climates, the journey can now be completed with more confidence and your bragging rights enhanced without fear of death.
8. Through ancient Kimberley, Australia —
This remote and beautiful part of Australia is the country's adventure cruise hotspot. The season is from April through to September, when the torrential rains have eased and water cascades off the plateau.
7. Pacaya Samiria Reserve, Amazon —
Piranha, sloth and pink dolphins inhabit the Pacaya Samiria National Reserve. You can commune with indigenous families living along the banks before retiring to a luxury 24-passenger vessel to fry your piranha.
6. 'Jungle Book' tour, India —
While the cruise aboard the 24-pax Charaidew trundles from Guwahati to Tezpur, you'll enjoy mild Assamese curries onboard and visits to a wildlife reserve en route.