In case you missed it, ice skating rinks, giant trampolines and rock-climbing walls on board ships are old news, along with wine cellars and menus from celebrity chefs.
The latest innovations for having fun in the middle of the ocean include a bowling alley aboard Norwegian Pearl, and a Flowrider, which lets you ride an artificial wave, on Royal Caribbean's Freedom of the Seas. Norwegian Pearl took its inaugural voyage in December, Freedom of the Seas launched last May, and another Royal Caribbean ship, Liberty of the Seas, which will also feature a Flowrider, debuts this May...