Royal Caribbean’s long-awaited Quantum of the Seas, the first in the line’s new Quantum class of ships, moved to Shanghai in the spring to serve the China market. Fortunately, cruisers who want to experience her much-touted onboard activities can do so on her identical sister, Anthem of the Seas, which launched in April in the U.K. and moves to New York City this week to do Caribbean sailings. Here, five things that make this ship so much fun: