Dining Outside the Home: Poseidon Coastal Cuisine & Rooftop Bar on Hilton Head Island, South Carolina. Bask in the vibrant hues of a glorious sunset over dinner and drinks at this local hotspot on the waterfront. Whether you choose musical entertainment at the Rooftop Bar, casual cocktails during NautiBar’s Happy Hour, or a flavorful dinner of surf ‘n turf, you’ll be happy as a clam. Peruse the extensive menu offering raw, steamed, broiled, baked, grilled, and fried selections. They’ve got it all. Do you know where you’re eating tonight? I do. Poseidon Coastal Cuisine.