The best eating in Boynton Beach is concentrated on and around Ocean Avenue downtown. The marina area has casual waterfront spots suited to a post-dive lunch; Ocean Avenue proper has a mix of Latin, American, and Mediterranean restaurants. For the price, Boynton compares well with nearby Delray Beach, which has a similar dining scene but higher tabs.
A few standouts: Two Georges Waterfront Grille on the marina has been a local institution for years, with reliable seafood and water views. The area around Pineapple Grove (technically Delray Beach, just a short drive south) is also worth exploring for dinner if you want more variety.