Hi, you can go to Badaling and Ming tombs in one day. First visit Badaling and then Ming tombs. You can take bus no.5 at Tiananmen Square and get off at Deshengmen Gate. Take bus no.919 at Deshengmen Gate and arrive at Badaling Great Wall. After visiting Badaling, you can take bus no.919 (慢) from Badaling Station and get off at Ming Huang La Xiang Gong Station (The Ming Dynasty Wax Museum), and take bus no.314 and get off at Dingling Tomb (one of the thirteen Ming Tombs).

You can have your lunch at Badaling Restaurant which is located about 200 meters from the wall. Or in the nearby small reasaurants which is very easy to find and withine steps distance.