It could be something as simple as watching a show together without the distraction of technology. Or it could be finding something like a hobby, a project, heck, even a meal. You might have to be the one to go out of your way to engage in something that he enjoys. Or, if you've got a willing partner, come up with something that you'd both like to do together.
But it needs to be something just for you two.
This past weekend we watched a movie together, no baby, no computer =)