Key Largo snorkeling is arguably the best in the Florida Keys! I've even written a blog post about why our reefs are better. For one reason, our reefs sit closer to the the deeper Atlantic shelf, where the waters are steadier, cooler, and more nutrient-rich--basically a spa for corals. In addition, for millions of years the longest island of the Keys--Key Largo--has served as a guardian, buffering and protecting the reefs from freshwater intrusion from Florida Bay.