Maui Ocean Center tops the list for an activity away from the beach. Its name even pops up as the best attraction in Hawai‘i. It brings the world of underwater Maui to everyone. Visitors stroll spellbound through a 54-foot clear acrylic tunnel set in a 750,000-gallon aquarium replicating the open ocean. Overhead, graceful stingrays undulate in lazy motion. Sharks, sometimes...