Miami to Key Largo is only 1-1/2 hours. To Key West would be 3-1/2 to 4 hours. If you want beaches stick to Miami Beach. The keys do not have great beaches. It's more about the water, the history, fishing, diving and snorkeling. And in Key West add the partying. Use www.mapquest.com to see routes, mileage and approx. driving times.
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