Cheongna-Michuhol-Wolhwawon
Cheongna Dream Park is bigger than you think and has good landscaping
But there aren't many birds. It would be nice to visit here during the cherry blossom season.
I've only visited Suwon Wolhwawon during the plum blossom season, but it's also a great place during the fall foliage season.
And it's even more beautiful at night than during the day.