While in Gent, ride the giant ferris wheel for just five euro. It's located at the foot of the Belfry, were part of the Christmas market is also taking place.
I have haven't been, in the past years, to the Christmas market in Gent so I have no terms of comparison but they really did a great job this year.
I've been to a few markets do far and this is is by far the biggest, most interesting, best street food and activities. I am impressed.