You just spent three days at Disney World. Your kids are starting to melt. The thought of another theme-park line might actually break you. What you need is sand, salt air, and somewhere to sit that isn't a spinning teacup. Here's what most visitors don't realize: the Atlantic Ocean is less than an hour away. Not Clearwater. Not a three-hour crawl across I-4. The closest beaches to Disney World and Orlando are Daytona Beach and New Smyrna Beach — both about 60 miles east, and