Hawaiian waters are full of oceangoing liners, but only one small ship operator, InnerSea, overnights here. Safari Explorer cruises the leeward coasts of Hawaii, Lahaina, Maui, and Molokai, giving guests as much play time in the water as possible. They snorkel in sea turtle and coral habitats, paddleboard and kayak, and swim by night with giant Pacific manta rays. In west Maui, they sail a hand-carved Polynesian voyaging canoe.
Pictured: Hiking on Molokai is playtime off a cruise ship.