Ok, so here's an alternate afternoon itinerary.
Go to Ocean Beach in San Diego and stroll Newport Ave.
Stop in at the Black and have a mind trip back to the 70's. Keep your eyes open for several of the used/resale shops - some have small bins for used LPs.
Head to the used LP shop called Cow Records and spend an hour flipping the bins.
Then walk across the street to the South Coast Bar & Grille - go UP the stairs to the bar area (no kids) and order some of their famous fish tacos - the shrimp tacos are killer, too. Go on a Tuesday or Thursday for the taco sale day.
If the weather is nice - stroll the longest concrete pier on the West Coast.
If you get thirsty, there are some brew pubs to quench it.
As mentioned - Hodad's serves killer burgers, but the lines can get long unless you get there early.