I passed through twice, had to be in the Netherlands for work and while I was there my partner visited family in the UK. So we took a week off after and met in Brussels before going to Ghent and Bruges and back to Brussels before heading back to the UK.
That first day we did wander and go to some of the sights (we aren't very touristy) but really liked it. If you ever are back in the area, I highly recommend Ghent!