Wanna wanna is a cool place to hang out and have a beer but their food ... It's just a fried shrimp or oyster basket and fries. Defenitly nothing to write home about. SPI severely lacks good restaurants.
Joes oyster house is the best food by far. Just before you cross over the bridfe to get to the island. It's not a cool spot to hang out or anything but the food is fantastic. We usually get a lot to go and eat it back at the condo for lunch. And the Italian restaurant by the lighthouse is really good as well. Can't remember it's name, marcellos maybe.