There are loads of lovely parks all around Suwon (thank goodness, this farm girl needs her fresh air).
Manseok Park is one closest to my home, and I go there quite often just to relax in the sun, read and watch people going about their days. At 12 every day they play music through a loud-speaker system and do a fountain display. And people exercise here night and day, literally. If you walk home from the pub at 1 in the morning, there will be people doing 10 laps around the reservoir...
A badminton hall - popular sport.
An open-air theatre used for live performances, and sometimes they display international events on screen too.