Directly across from the San Diego Convention Center is Tin Fish (http://thetinfish.net). It is a small restaurant with most of its seating outdoors–not a problem in sunny San Diego–and it serves primarily one thing, fish tacos. They do serve hamburgers and chicken nuggets; so if your convention partner doesn’t like fish tacos, bring them anyway.
Californians take their fish tacos seriously and here you can get your choice of 6 different kinds of fish and preparations. The important thing about this is that the world over convention centers offer the epitome of pre-packaged inedible food. I have experienced convention center food in at least 12 major American cities each and they all make airline food look appealing.
But here, just a short walk across the street is this gem of a spot. I went at lunch during a week-long conference, so drinks were not on my menu but it did look like a fun “beachy” bar to spend some time. It also looks like a spot that would be crazy busy during a Padres game since Petco Field is a block away.