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For good food:
Tiki Bar at Riviera Beach Marina; great waterfront atmosphere and good fish dishes
Longboat Johnny's across the bay on Singer Island, wonderful mahi with rum and bananas, and absolutely the best chocolate and carrot cakes you have ever tasted (homemade)
Brass Ring Pub for the best burger in town: A basic bar with really good quality meat and frequented by divers. Just north from Abernethy, they can point you there.
And, for in my view the best seafood restaurant in Florida, the Food Shack in Jupiter. This is in a shopping mall at Indiantown Road and U.S. 1. Never had more creative and delicious fish cooking anywhere, and that is going some! it is a 20 minute drive and worth every second. Huge portions and reasonable prices, on top of everything else. Make sure and ask what their "secret" ice cream is for the day. They make it there and we have had nutella one day (die for) and jalapeno that were both out of this world (yes, jalapeno!).