We have a free stay at a B & B in Brugge for 12 days next May. We understand this is a long time for even a cute town like Brugge. Can anyone suggest daytrip destinations that we would enjoy visiting? We would be using public transportation only. Thanks so much.

Wow 12 days in Brugge is a long time... we were just there (on our second visit) for two nights/3 days and it was plenty of time! Although if your stay is free...

The B&B we stayed at had bikes to use so we took a nice (flat) ride up to Damme in the rain. I'm sure there are other places to explore by bike.

Lots of places to day trip to depending on how much time you want to spend on the train: Gent, Brussels, Den Haag, Delft, Rotterdam, Antwerp, even Amsterdam or Cologne.

How about Paris?

12 days is a long time. I have relatives that live there so I know. Anyway I can suggest a trip to Namur/Dinant, the other side of Brussels approx 1.1/2 hrs depending on train schedules. As previous reply virtually everywhere is within reach but Cologne is about 4 hrs and Paris is via Brussels on the Thalys but definitely within reach as is Amsterdam. Gent is approx 1/2 hr and a change of scenery or try Middleburg and Sluis.
Hope this helps

Take the train up to Ostende and visit the beaches. There are old WW2 bunkers along the coastline dunes. The boardwalk goes all along the coastline. Train costs about 3 euro and takes about 15 min.

From Ostende you can take the tram that runs the full length of the Belgian coastline, from Knokke-Heist to De Panne. There is so much of interest along that route. We spent a week in that area; most of the time we hopped on and off that tram at spots that interested us.

Each town along the Belgian coast has it’s own personality; De Haan is a beautiful village, Newport has a huge pleasure-craft harbour, quaint old village, & excellent war memorials, Oostduinkerke has the shrimp fishermen on horseback each September, Raversijde has the Atlantic Wall war bunkers and tunnels.

We were lucky to be visiting during the Beaufort Art Festival (held every 3 years). There are most unusual large art installations at many points along the coast. Di

In addition to di2315's post, the coastal town of Knokke has great shopping and restaurants, and the nature reserve 'Zwin'. Rent bicycles and explore the coast.
Other daytrips; Damme (cycle to Damme from Brugge), the Flanders Fields museum in Ieper, Antwerp, Brussels, Gent.
Maybe consider renting a car for a few days to explore the countryside?

Another vote for Dinant! I saw a picture in a guide book and knew I had to visit... if only for lunch and a few hours of looking around on my way to Namur!

I also enjoyed the Damme bike trip, if you are so inclined. There are also small van tours of the WW I battlefields - fascinating if you have any interest in history.

Thank you all for the great suggestions. Happy Holidays everyone!

Another option you could consider, since your accommodations are free, you might be willing to eat a night or two. Lots of places mentioned above are reasonable day trips. But less than a full day is not much for Amsterdam You could go early in the AM and come back the next afternoon or evening and have nearly 2 full days for A'dam. Same for Paris.

One or two nights away plus the day trips and you'd still have mostly free accommodations.

janisj makes a lot of sense. I liked Brugge alot, but 2 or 3 full days would be enough for me.

Spring for the four extra hotel nights (since the others are free!).

If it were I, the plan would be (not aboslutely certain about train times, but probably pretty close):

2 nights in Amsterdam
--dep 6:35, arr Amsterdam 9:43 am
--dep 7:16, arr Brugge 10:25 pm
--nearly 3 days in Amsterdam

2 nights in Paris
--dep 6:25, arr Paris 8:59 am
--dep 6:25, arr Brugge 8:53 pm
--nearly three days in Paris

1 day trip to Brussels
2 day trips to other Belgian cities.

If you take Tulips suggestion to go to Knokke-Heist then you might duck into the casino for a few minutes. It's a cool little art deco building that was once a happening little place but it fell and a French group bought it.

The casino has a mural by Magritte in their upstairs gaming room. It was one of his first commissions. Also, a Keith Haring mural although it's blocked off by a wall. The Magritte is protected but not the Haring. If you go downstairs, they have/had the largest chandelier in Europe- it's a God-awful thing. Plus a couple of pieces by Paul Delvaux. (Another of Belgium's favorite sons.)

I would def. recommend checking out the WWI battlefield areas. Ypres-Menin Gate, the nightly ceremony that takes place there in recognition of all the soldiers killed, numerous cemeteries. Also, the Ardennes with more history being there for Battle of the Bulge Memorials.

traveltalesfromtheredheadedtraveler.blogspot.com/
(My travel writing blog!)

You can take the train from Bruges to Ypres and rent bikes to explore the battlefield areas and memorials but there are also numerous tour outfitters as well. I missed your mentioning of only using public transportation so the Ardennes might be a bit difficult.

traveltalesfromtheredheadedtraveler.blogspot.com/
(My travel writing blog!)