If you only have time for a quick stop, close to the port, that doesn't mean you can't experience the best of what Barcelona has to offer when it comes to dining. The city's port restaurants are tasty with many of them catering to those looking for an authentic Spanish flare as well as a more international and Mediterranean feel. Since the port isn't far from the Old City, if you're willing to walk a few minutes you'll find a wide range of excellent lunch and dinner options in the Raval, Gothic Quarter and close to the Barceloneta neighborhood, all of which have great places to eat. And in the summer their terraces are ideal for a beautiful meal overlooking the port, the Ramblas or the sea.
As the port is also near Poble Sec neighborhood, this gives people a chance to eat in a lesser explored part of Barcelona. Poble Sec is one of the city's fastest up and coming 'barrios' and it has some fabulous hidden gems. The area is home to Ferran Adria's two newest restaurants, Tickets and 41 Degrees, thus welcoming a string of high quality and authentic establishments.
So whether you have an hour or a day to delve into the city, you don't have to go far from the port in order to get a taste of Barcelona's culinary expertise.