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Whatever Mike_S
Key Largo Conch House (formally the Key Largo Coffee House) is my parents place, so I'm a bit biased - BUT I have been in and around the Key Largo area for the last 10 years and I have to say hands down best food for the best price. My family puts their heart and soul into that place as many of the posters here can tell you! There are a lot of restaurants in the Keys supported by investors, but my parents place is run by you guys and your patronage and support. On behalf of them - thank you.
I'll add the Buzzard's Roost in upper Key Largo to that list, just off Garden Cove Road (side street just before where the dive boats dock).
And I always like Bentley's down in Islamorada.
For casual (right off the boat) dining, Mrs. Mac's is a great choice (perhaps the best all-around choice for a post-dive lunch).