Royal Caribbean’s Symphony of the Seas is a 1,188-foot behemoth. Roy Riley / sbw-photo The biggest cruise ship in the world is here, and it’s a place where you’ll be hard-pressed to get bored.

I boarded the 1,188-foot ship for a vacation with my extended family, a group that chose the Symphony of the Seas because of its many amenities for kids and teens. All 10 of us were spread out across ...