San Diego is home to casual breakfasts by the beach. Here are some local favorites (by neighborhood):

Ocean Beach:

Shades Oceanfront Bistro, 5083 Santa Monica Ave, oceanfront in OB with outdoor seating and dog friendly, Shades is open 7 days a week and is a favorite of "Dog Beach" locals for a post play breakfast.

Newbreak Cafe,  beachside in OB, great breakfasts, coffees and teas, with bulk coffee & teas to go. 

Mission Beach:

The Mission, 3795 Mission Blvd, a few blocks north of Belmont Park, is a modern cafe with well-presented healthy dishes at affordable prices. The menu runs the gammut from the Banana Blackberry Pancakes for the sweettooth, to the Zen Breakfast, with scrampled egg whites, braised tofu, brown rice, and grilled veggies for the health nut. There is also a great selection of Latino Breakfast Plates and blended coffee drinks. The best part is once you've finished breakfast, you can just walk across the street and take a stroll down the Mission Beach boardwalk. 

Pacific Beach: 

Fig Tree Cafe , 5119 Cass St. Seating under big beautiful ficus trees, surrounded by a white picket fence: Great breakfast / lunch restaurant. Organic, amazing coffee. Fresh tasting ingredients, they grow their own rosemary! Good portions, great prices! Terrific ambiance.

Kono's Cafe, 704 Garnet Ave, located at the base of Crystal Pier in Pacific Beach (P.B.), serves the ultimate breakfast burrito. This surf cafe, which serves breakfast all day, is a favorite for locals and tourists alike. Don't let the line that often extends down Garnet Avenue dissuade you; their Breakfast Burrito #1, with a hearty portion of eggs, avocado, sausage, cheddar cheese, and hot sauce, is to die for. Plus, there is patio seating across the boardwalk so you can sit in the sun and watch the surfers by Crystal Pier.

Broken Yolk, 1851 Garnet Ave,  is the ultimate spot for eggs. A local favorite, this place gets pretty crowded on the weekends. If you're in the mood for eggs and cheap, this is the place. Their menu must have over 50 egg dishes.

The Green Flash, 701 Thomas Ave, right on the beach in Pacific Beach, great views and food to match including some Mexican favorites as well as standard American fare for breakfast.

La Jolla:

Caroline's Seaside Cafe, on the campus of Scripps Institution of Oceanography, overlooking La Jolla Shores Beach. Chef Giuseppe, who also has the Museum Cafe at the Museum of Contemporary Art in the village, presides over this popular eatery. Locals love it for the great food and the fantastic view. Breakfast is served 8-11:30 am Mon-Fri and brunch is 8 -3 Sat-Sun. Tel. 858-202-0569.

Goldfish Point Cafe, 1255 Coast Blvd., just up the street from The La Jolla Cove. The great view, good food, and free wi-fi have made this place a local institution. Named for the historic cliffs it overlooks. Lots of early-morning Cove swimmers congregate here to get warm after working out. Tel 858-459-7407.

The Living Room , 1010 Prospect Street , at the intersection of Prospect and Girard (2 main streets in downtown La Jolla), is great for their coffee, espresso drinks, pastries, and desserts, and their proximity to the great boutiques in La Jolla. They also have a great  view of the Shores out their back window. 

Brockton Villa Restaurant,  1235 Coast Blvd, directly above La Jolla Cove with innovative dishes for breakfast including house made, beer brined corned beef hash and a house made carne asada breafast burrito with creme fraische.

The Shores,  8110 Camino del Oro, on the beach inside the La Jolla Shores Hotel. An unbeatable location when you want to treat yourself to great food and a great setting.

Del Mar:

Americana, 1454 Camino Del Mar, where Camino Del Mar hits 15th Street, has a great brunch menu, with omelettes, eggs benedicts, and waffles. Order your coffee to go (or pickup a cup across the street at Starbucks) and take a walk along the beach, just a block away.

Encinitas:

Ki's Restaurant,  fresh and locally sourced where possiblr, also organic where possible, Ki's serves up great breakfasts seven days a week.