Tropical Islands recreates a balmy paradise in an old airship hangar about an hour from Berlin.Credit: Sean Gallup / Getty ImagesKey PointsAbout an hour’s drive from Berlin, Tropical Islands is one of the most impressive indoor water parks in the world.Guests can ride down Germany’s tallest indoor waterslide tower or go diving in a miniature sea.The park also offers shopping, dining, and overnight stays in beach tents or themed hotels.If you’re …