I live in Key Largo, and I am an active diver and snorkeler. We take all our snorkeling guests to Grecian Rocks. It is very shallow. Every time is different. At certain times of the year there are many large (not aggressive) baracuda. There are often many queen conchs in the sea grass. On a good day, it is great, with a variety of colorful reef fish.
I recommend buoys G3, G4, G2 and G1, in that order.
For first-time Key Largo snorkelers, we recommend Christ Statue and Grecian Rocks. They are about one mile apart.
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