I hope that you're not simply staying in Brussels. It's only a short (30 minute) hop on the train from Brussel-zuid/Bruxelles Midi to Ghent, which is absolutely stunning (and full of lively bars too!)
https://visit.gent.be/en/home
If you do fancy giving it a go, the station to aim for is Gent-
Sint-Pieters but you might see the city referred to on station indicator boards as 'Ghent', 'Gent', 'Gind' or 'Gand'! (You need to take a Number 1 tram from the rail station into the city centre, with the destination shown as Evergem/Wondelgem, alighting at Korenmarkt).
It's only a little further along the same rail line to Bruges (a.k.a. Brugge), with Ostend (Oostende), on the coast, just beyond that.