Rain and waterways are so important in an agrarian economy - but now, perhaps, Korea is moving from dependance on agriculture to a more diversified economy.
You will see cities and towns always located near water because traditionally those were the arteries that supplied life to the urban centers.
What I see in your post, @slowwalker, is people seeking out the river simply for enjoyment and entertainment.
It's fortunate when water is easily accessible and the people can relax and enjoy a day in nature.
It also looks like you enjoyed yourself too, @slowwalker!
Thank you for your comment