The third ship to join the innovative Oasis class of Royal Caribbean ships, Harmony of the Seas boasts seven distinct neighborhoods, each offering a wide array of activities, amenities and entertainment. For the action-seeking cruiser, the ship offers two FlowRider® surf simulators, two 43-foot high rock-climbing walls, three water slides, an ice skating rink, a mini-golf course and a zip line that soars 9 decks in the air over the ship. For a more relaxed time, visit the full-service Vitality Spa, take a yoga class at the Fitness Center, or soak up some sun at one of the four swimming pools.