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Much has been written about Key Largo and its tourists attactions on the internet. Here's a place to start your search, tempered by guides like Trip Advisor that are unique in the fact that they bring many different inputs for one to read and compare before their trip.
The 'Official' Key Largo in the Florida Keys web sites are as follows:
VisitFlorida USA This is the State of Florida's main tourist site for Key Largo through Key West