Royal Caribbean’s new Symphony of the Seas, including “Ultimate Family Suite,” will carry more than 5,500 passengers.

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MIAMI — Royal Caribbean International’s new ship, Symphony of the Seas, will be an ode to the family vacation.

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The massive vessel will begin sailing from Barcelona this spring, carrying with it the title of biggest ship in the world, with a double-occupancy capacity of more than 5,500 passengers — or almost 6,900 if every berth is occupied, according to the CruiseMapper website. (The average ocean-liner passenger capacity is around 3,000.)

Inside “Symphony,” expect a bevy of family-focused activities.

Like each Oasis-class ship before it, dating back to the debut of Oasis of the Seas in 2009, the Symphony will introduce a new “biggest at sea” feature. This time, it’ll be the largest laser-tag arena at sea, located in Studio B, a multipurpose activity space that also doubles as the ship’s ice-skating rink.

The laser-tag feature is a popular choice this year. Norwegian Cruise Line is also debuting a laser-tag arena on its new Norwegian Bliss, but Norwegian’s will be outdoors. Both Royal and Norwegian’s laser-tag features will carry space themes, with Norwegian’s modeled after an abandoned space station and Royal Caribbean going with a battle for the fate of the last-planet-in-the-galaxy vibe.

“We think the kids are going to engage on this big-time,” said Michael Bayley, the Miami-based line’s president and CEO.

The other major family-friendly feature will be the 1,346-square-foot Ultimate Family Suite. This massive, two-level suite will include a kids-only bedroom — with slide access to the living room, no less — a separate adult’s room, a floor-to-ceiling LEGO wall, an air-hockey table, a 3D movie theater-style TV room — with a popcorn machine, of course, and video games — and a wraparound balcony with a full-size whirlpool and pool table.

There will only be one of these mega-sized suites on the ship, Bayley said, with room for up to eight.