Did some strolling in an park whose name I can't recall at the moment, but it's an easy find from Hapjeong Station (합정역), Exit 8. You have to cross the bridge to get to it, since it's on an islet in the middle of the Han River.
Thankfully, there are lots of places with shade, and it feels like a little man made forest. Nice, quiet place to picnic and take in the sun (or avoid it, if you're like some Koreans?)
And find the inner kid in you...
*Note: I just got objection from uploading this to YouTube so out of respect for the video's star, I'll be nice and set it to private, haha. ; )