In case there was any doubt left that the cruise industry is turning away from retirees and toward Millennials, make way for the Norwegian Bliss.

This cruise ship continues the long industry drift away from shuffleboard and a good book and toward adrenaline sports and pants-wetting thrills: Its signature feature, as seen in the rendering above, will be a twisting go-kart track plopped on a portion of its top deck.

The nearly 1,000-foot-long track will be in a rough cloverleaf pattern on two levels behind the smoke funnel. So that the snarl and fumes of standard motors don't annoy other passengers, these carts will be electric and the sound of engines will be piped into each cockpit so only their drivers can hear it.

Another signature amenity on the 4,000-guest Bliss: an outdoor laser tag game themed to an abandoned space station. Just like Ethel Merman used to play with Janet Gaynor on The Love Boat! Add to that a few water slides, including one with see-through segments and one that loops out over the open water.

In lots of ways, what's below decks is typical for a modern cruise, too—stuffed with options and colorful: Starbucks outpost, a bevy of speciality restaurants (Norwegian's system allows you to eat where you want rather than corralling everyone into the same dining room for each meal), a 24-tap beer pub, and more. There are also partnerships with Jimmy Buffet's Margaritaville, the Mondavi wine family, and Mandara Spa. Whereas Royal Caribbean's ships tend to collect guests indoors, as if it's a floating mall, Norwegian's recent ships (starting with 2013's .

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