Harmony of the Seas® part of Royal Caribbean's Oasis Class fleet. There's no turning back once you take the plunge 10 stories into the mysteries of the deep on the tallest slide at sea, Ultimate Abyss, as well as the exhilarating multilevel Perfect Storm slides. We've also re-imagined and enhanced the unique experiences that have made Royal Caribbean the best cruise line overall 12 years in a row. As you take a tree-lined stroll through Central Park, enjoy the fun of a classic boardwalk or find your own haven in any of the other seven iconic onboard neighborhoods. Sit back and watch for the first time at sea, Broadway's hit Musical Grease. Share every moment with not just family onboard, but friends back home with VOOM - the fastest Internet at sea.