I always like the patio at Talula. I've not been but have heard the DiLido Beach Club at the Ritz Carlton is nice. The Standard goes in the same category (not been, heard it's nice, though have generally heard better things about the food at DiLido).
210 23rd St, Miami Beach, FL 33139
Ate at both a few times to satisfy the waterfront tourism obligation (WTO), and each atmosphere was better than the food in my opinion, which is why you want to go to begin with. There were high spots -- fries, lobby design, water, and music at The Standard and the idiosyncratic ocean promenade walkers and pita somethin' or other at DiLido.