Hawaii Island is the only place in the world that offers nighttime manta ray encounters with more than 90% consistency. Kona’s manta rays perform a seemingly choreographed nocturnal ballet, conducting barrel rolls at the water’s surface as they return to the same spot each night for dinner. Travel Channel called the manta ray snorkel “one of the top 10 things to do in your lifetime,” and this bucket list activity is a must-do for every visitor to Hawaii’s Big Island.