There are plenty of fish in the sea, or at least on the white-washed walls, at Williamsburg's Ensenada. If the decor didn't give it away, the menu will. It's all about seafood here, albeit with a Mexican bent.But first, there must be chips...with all the salsas. Tacos are always obligatory; even better when stuffed with grilled spice-rubbed shrimp and topped with pico de gallo and pickled slaw. The aguachiles present a pick-your-own edible adventure, allowing diners to select seafood or go fish-free. Desserts are limited, but don't skip the hibiscus pie encased in a crumbly cookie crust with hazelnuts and sea salt. The revelry continues downstairs at the Black Flamingo cocktail bar, where a DJ spins tunes.