Royal Caribbean has debuted many high-energy activities at sea, but keep in mind that there are 25 ships in fleet. While they all now have rock climbing walls on board, not all the ships have things like, say, a surfing simulator or an ice skating rink. Make sure you do a little research on what’s offered so you’re not surprised (or let down) when you arrive.
Here's some info that will help you choose: The fleet is divided into seven classes, a group of ships with similar design and activities. If your heart is set on the new, crazy activities the line is known for — think skydiving simulator and robot bartenders — book a mega ship from the Quantum Class. Or, if you know you want to zip line on board, choose the Oasis Class. And if you want a more low-key experience (say 2,000 people on board rather than 6,000), book a mid-sized ship from the older Sovereign or Voyager classes.