Chloe YinA 3.5-hour drive from Miami, along the US-1 cross-sea Route 1, self-driving is an infinite tropical island scenery. The Google map shows the four main islands of Key Largo, Islamorada, Marathon, Big Pine Key, and Seven Mile Bridge. They all belong to the Florida Keys group. Most people will choose Seven Mile Bridge to stay for a while. This is the longest bridge in Florida and a cross-sea bridge that was once devastated by hurricanes.