Naomi Watts and Liev Schreiber took their sons Sasha and Kai out yesterday for an afternoon in the sun. The foursome were seen riding bikes around their Brentwood neighborhood, and visiting a local farmers market, where the boys took turns on an inflatable slide, and Kai hitched a ride on his dad's shoulders. The Watts-Schreibers split most of their time between LA and NYC, but also pay plenty of visits to Naomi's native country of Australia. In fact, she was Down Under for much of February filming a new movie. She costars in the upcoming drama The Grandmothers with Robin Wright. Naomi wore a bikini during several days of shooting by the ocean.