ig is too little a word to describe the newest ship in Royal Caribbean’s fleet. Gargantuan is more appropriate. Symphony of the Seas stole the title of largest ship in the world (from its sister Harmony of the Seas) when it made its inaugural cruise from Barcelona in late March. And like all of the cruise line’s Oasis-Class ships, this one offers an oversized adventure at sea: 2,759 staterooms accommodating 5,518 passengers (up to 6,680 at full capacity), a crew of 2,200 (from more than 150 countries), seven distinct “neighborhoods” and a nonstop lineup of onboard entertainment, activities and thrills. There’s so much to see and do — including dining at 20 restaurants (two of them new concepts), sipping at every type of bar imaginable, and splashing in two dozen pools and hot tubs — that enjoying it all during a week-long cruise can be a challenge. Here’s what’s new and what continues to captivate onboard Symphony of the Seas, as well as the itineraries that will take you to islands in the Mediterranean and Caribbean.