Well - we used to have a set night of the week (the night we used to waste on our bad marriage counselor! LOL! We would have been better of from the beginning to have had date nites rather than counseling, I think!) and I think we'll go back to that. In our case, our schedules are so busy with the kids and other things, that if we don't make the commitment, it just gets pushed out of the way by other things. We picked Monday nights because there are fewer conflicts (usually no homework deadlines that early in the week, no other social engagements to conflict) although that also means we aren't free to stay out late.
This is not a fancy date thing - just a chance for the two of us to be alone together and actually have conversation. Sometimes we will see a movie - often we'll just go out to dinner - and usually deciding what or where is a mutual thing.
Our objective is a little different than yours, though - see, we're just trying to find a little time to be alone together and have a conversation that isn't continually interrupted by the kids. We do have social outings on the weekends that involve friends.
In your case, you might want to set up some more exciting, interesting dates. Maybe take turns planning?