If you're the kind who's impartial to a day out at a winery, brewery of distillery, mixed in with a bit of culture amid nature, then a day trip to Sansawon Brewery & Museum is a must. A producer of traditional Korean liquors, Sansawon is all about quality, chemical-free makgeolli , soju and rice wines; far removed from nasty hangovers from convenience-store items. For only ₩2000 you get a sampler and shot glass for unlimited tasting.
Also here is a museum of traditional brewery equipment (no English signage, unfortunately).
Outside stand rows of ceramic vats containing soju left to age. It's a lovely outdoor area and we highly recommend packing a picnic lunch and buying a bottle to enjoy on the lawn.
It's worth getting in touch with Makgeolli Mamas & Papas , experts in the field, to see if they're running tours.
Otherwise, take the bus from Dong Seoul terminal (across from Gangbyeon subway on line 2) to Pocheon (₩6000, one hour and 10 minutes). From here it's a 10-minute taxi ride for around ₩8000.