My recent discovery is the Korean Design Center in Seongnam. It is a creative building funded by the Korean Government and comes with a fun park with a pool ready for play and some dinosaurs, yes, DINOSAURS!
Just head to Yatap-Dong where you can not only visit this center but explore a nice shopping street, grab some coffee from the numerous chain and non-chain coffee shops and even enjoy a nice walk along the Tan-Cheon river.
There appears to be many more locations to be checked out in Bundang!
Direct website http://gd.kidp.or.kr