This $157,000 rocketship is the perfect drop-top to drive to the slice of Florida paradise that's Boca Grande, blogs Road Test Editor Howard Walker. When you have a stupendous sportscar for the weekend, like the 550-horsepower Mercedes AMG GTC Roadster I'm driving, you need a great destination to cruise to. Sebring or Palm Beach Raceway come to mind. But if you prefer not to wear a helmet or burn rubber for your weekend drive, there's this tiny sliver of paradise, seven miles long, maybe half a...