DMM Kariyushi Aquarium is a modern aquarium in southern Okinawa, much easier to reach from Naha than the larger Churaumi Aquarium in Motobu. Its displays mix marine tanks with digital effects and family-oriented exhibits.
It works best as a convenient half-day option if you are staying around Naha or travelling with children. Serious aquarium fans may still prefer Churaumi for scale and depth.