Key Largo is part of the Upper Florida Keys Archipelago and is itself the largest section of the Keys, at 33 miles long. Key Largo is the northernmost point of the keys and acts as the first stop of the Florida Keys, connected to South Florida via U.S. 1 (also known as the Overseas Highway) and only an hour drive from the Miami International Airport.
Key Largo has a tropical climate; the island enjoys a great amount of sunshine each year and has never had a recorded frost. The island features in many places fossilized corals and smooth, eroded limestone; the island itself is a fossilized remnant of a coral reef formed during a time in the past with a much higher sea level. The natural shoreline of Key Largo is quite rocky and there are no natural sand beaches on the island. Marl, a limestone-based clay marks the shoreline and nearby soil. The island shows a diverse variety of plant-life of all types further in.
Visitors and residents have much to enjoy with a deluge of sea-based and land-based activities. Key Largo declares itself the Dive Capital of the World with locations like the John Pennekamp Coral Reef State Park, which features the only living coral reef barrier in the continental United States. It is also near the Everglades National Park, the Dagny Johnson Key Largo Hammock Botanical State Park and the Florida Keys National Marine Sanctuary. If competition is what you're after, it can be found in the form of sport fishing, something Key Largo is famous for.
Key Largo provides a good starting point to the culture and style you can find within the Florida Keys. There are a number of additional resources available to help get an idea of what to expect in Key Largo, places to visit, and areas of note. The resources for Key Largo can be found here and a list of homes for sale in Key Largo is available here.