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A Texas-size welcome greeted the Carnival Magic when it sailed into Galveston for its U.S. debut last November, fresh from an inaugural season in Europe. It's the first brand-new ship to regularly cruise from the Gulf Coast city, about an hour from central Houston. Homeported within walking distance of antique shops, art galleries and low-key bars in Galveston's historic downtown, the Magic tempts travelers year-round with three different itineraries -- two in the Caribbean and one in the Baha...