This will prob get moved to Miami board but I'm from there and happened to be looking for Boston suggestions so I'll help ya. Keep in mind Miami Beach where SBWFF is located is not Miami. Good 10-15 min can ride between the 2. Here's suggestions for beach & mainland...
Milos (Mediterranean, very $$$$$)
Michaels Genuine Food & Drink (top spot in Miami also closest to Beach, just over bridge)
Edge Steak & Bar
River Oyster Bar
Sakaya Kitchen (more of a lunch spot)