Onboard Obsession is a new series that explores the can't-miss highlights of the best-loved cruises—from the shore excursions to book to the spa treatments too relaxing to pass up.

Eighteen decks above the cold Atlantic Ocean, I pulled on a balaclava and helmet and did something I hadn’t done in decades: stepped into a go-kart. 

The last time I was behind the wheel of a go-kart was about 25 years prior, at a Six Flags amusement park. This time I was somewhere far more exciting—cruising between Iceland and Ireland on the Norwegian Prima. 

The Norwegian Prima takes go-karting at sea to a whole other level—literally. Instead of two decks like other Norwegian ships, the Norwegian Prima’s 1,400-foot go-kart track is spread over the ship’s top three decks. And that third deck makes a huge difference. 

The first time I accelerated up the hill to the track’s third deck, I was scared of flying off the top of the ship. Having lived in walkable cities for more than a decade, I rarely drive nowadays, let alone in miniature race cars on moving ships in the middle of the ocean.

It was the kind of cold and windy day you would expect off the coast of Iceland, and I couldn’t see anything but the ocean over the horizon. I hit the gas, hoped for the best, and breathed a sigh of relief when I made it to the top deck. It was so much more exhilarating than I remembered. It’s mind-bending to drive a go-kart on a moving cruise ship without a speck of land in sight. That alone is worth the price of admission. 

Like many things on Norwegian ships, the race track isn’t included in the cruise fare. Rides are $15 each. For an extra $5, you can have the track to yourself for three laps and drive at faster speeds. For $199, you can buy unlimited rides for your cruise.