BRUGES is awesome! You'll love a day trip there.
The information cautions that it is about 20 minutes from the parking area to the center.
The bus will probably let you off at the train station, which is about 20 minutes from Markt Square, which is the centre of everything in Bruges.
Walking from the station to Markt (if that is indeed your route) will take you near the Begijnhof, an old convent that provides awesome photo ops of medieval buildings, canals, swans, and if you're lucky, a nun in her Beguine habit.
At Markt is the famous Bruges Belfry Tower, made famous in the film In Bruges (see it before you go, if you can). Also tons of cafes, chocolatiers, and pleasant streets to wander around.
If there just for a day, I wouldn't add more than two "destination" stops. Perhaps the Church of Our Lady to see the only Michelangelo statue outside of Italy, if you like art. Or a climb up the Belfry Tower itself for 360 views and (if timed right) a carillon bell show.
Take in a boat tour around the canals of Bruges. I think they are a half hour, departing from many locations on the canals east of Markt.
And that should do you for an awesome day in what I think is the most beautiful city in Northern Europe.