If you want to do something nice in Brussels you have to go the Winter Wonders ! It's on the Grand Place and Place Sainte Catherine. It's during the month of december until january I think. I went last year with my husband and it was great! So I advice you to go if you go to Brussels. I found some good information on this website http://www.brusselscity.net/winter-wonders/ maybe it can help you :)