Māʻalaea
Hawaii's largest aquarium, built around Hawaiian ocean ecology. The 750,000-gallon open-ocean tank is experienced through a 54-foot acrylic tunnel. The humpback whale exhibit (January–April) is outstanding.
Buy tickets at mauioceancenter.com ($25–35/person). VIP behind-the-scenes tours available by arrangement. Open daily 9am–5pm.
Indoor — excellent rain-day activity.