Ralph Brennan’s lively seafood house anchors the top of Bourbon Street, serving Gulf catch with a New Orleans accent since 1997. The wood-burning grill turns out hickory-grilled redfish, and the flash-fried BBQ oysters — tossed in Crystal-honey hot sauce with blue cheese — have become a city classic. Finish with the double chocolate bread pudding in a room as colorful and buzzy as the street outside.