I have been asked this by a good friend of mine.
Following a few problems in her marriage they have both sought counselling- they have agreed to write each other a contract which they will then use to review every now and then. They will use this to highlight any possible areas of concern.
The only things that I could offer her were:
To not have tv on 2 nights week and to prepare/make a meal together and eat by candle light (they used to be real foodies)
To go out together once a fortnight (in the evenings) they haven't done mych of this since the kids came along.
I couldn't really go beyond that but thought I would ask here and then pass the great suggestions off as my own 
Anyone?