Here is another idea from Alysia. This is one I have heard of before but never tried. I think it sounds interesting.
"Plan a special dinner for two! Either have the children eat early and do a quiet activity while you eat, or do it after bedtime. This has been fun, and feels like a date, even when we haven't left the house=) I have moved a little table into the living room with candles and dim light, and it felt real 'restaurant' like=)"
Have you ever done this? If so how did it work for you. I am trying to imagine this with our kids. Doing it after they go to bed (Around 9:30) sounds a bit late but I think they might enjoy being the wait staff if they are still up..... It might work.