After living it up in Cancún, it's time to head south along Highway 307 to the 100-mile stretch of coast known as the Riviera Maya. The road, now a four-lane highway that runs inland and parallel to the coast, winds through dense jungle occasionally marked by spectacular Mayan ruins and dotted with beachside villages and resorts. Here, on crescents of powdery sands washed by the turquoise Caribbean and edged by tropical jungle, you can get away from the hustle and bustle of Cancún.