Robin Thicke -- I'm Going 'Round and 'Round To Save My Marriage

Robin Thicke may have failed as a husband ... but it seems he wants to show Paula Patton he rocks hard in the daddy department.

Robin went public in ATL Thursday with 3-year-old Julian at the 20 story high SkyView Ferris wheel.

The singer racked up some miles just to give Julian a thrill. He had flown from Detroit to Atlanta just to ride the Ferris wheel, then hopped on a plane for North Carolina for another concert.

Paula's back in Vancouver working on her movie -- but if she sees this ... well, baby steps.