€24.60 return: no such thing as a day return other than B-Excursion tickets which include something other than the train fare.
There is a train from Gare centrale at 09:00 which arrives in Brugge at 10:02 (final destination Oostende), however you can also leave from Midi or Nord if more convenient (the first 4 minutes before and the second a few minutes later than times from Central). There are about 3 trains an hour, and the same for returning to Brussels, obviously, e.g. 15:58.
There are 2 B-excursion possibilities for Brugge:
"Bruges culture et histoire", which costs €37.10 including city tour by bus and, I think, boat, and entrance to several museums and the Belfry; and
"Choco-Story + Musée du Diamant + musée du Luminaire" which costs €27.80
If these interest you, you just ask for B-Excursion ticket at the station ticket window, specifying which one you want, of course. Unfortunately details on B-Rail website are only in French or Dutch apart from general description, see http://www.b-rail.be/nat/E/
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