Ben Affleck was just like every other Los Angeleno Sunday trying to get around the L.A. Marathon, so of course ... he asked the paparazzi for directions.

The actor was out with his kids in the Pacific Palisades, when he realized he'd have to cross San Vicente Blvd. to head south ... but couldn't, 'cause it's part of the race course.

Who needs GPS when you've got eager paps standing by, and the exchange between them and Ben couldn't be more of a Southern Californian moment. 

Ben, what are YEWW doing here?