Any morning at Amavida Seaside or Rosemary(ok I am biased) - I always see at least 3 or 4 people I know, usually more. Great way to catch up and start the day.
Hibiscus is another great "locals" breakfast spot- especially Sundays when Hibiscus hosts local non-profits. A great opportunity to meet people and hook up with various local organizations- the best way to meet people is volunteer!