Yes, the zipline on Symphony of the Seas is entirely free and included in your cruise fare. Suspended nine decks above the Boardwalk neighborhood, this exhilarating 82-foot-long ride offers a unique bird's-eye view of the ship. In 2026, Royal Caribbean continues to offer this as a "signature" Oasis-class experience with no reservation required, though it is a popular attraction with occasional wait times. To ride, you must meet certain physical requirements: a minimum height of 52 inches and a weight between 75 and 275 pounds. You also need to wear closed-toe shoes and sign a standard safety waiver, which can be done via the Royal Caribbean app or at the onboard kiosks. It is a "one-and-done" rush that lasts about seven seconds, but most cruisers find it worth the climb for the sheer novelty of flying across a massive ocean liner while at sea.