If you like high-energy, push-it-to-the limit performances against a backdrop of pulsating lights and music, The Fine Line is a show that will knock your socks off. Featured at the Aqua Theater on Harmony of the Seas, it combines acrobatics and high-wire artistry with gasp-inducing high dives. Most amazing of all, it takes place on a ship at sea moving through the waves at 22 knots. One word of caution: If you sit on the front row, wear a raincoat. But don't miss this one. -- Gerry

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