Ilsan Lake Park is one of the largest man-made lake park in Asia, spanning across over 990,000 square meters with a musical fountain, 4.7 km bike path, foot path, 100 species of wild flowers, and a forest with 200,000 trees.
The park is very big. Be prepared for a good couple of hours walk if you take a loop. It is a very nice walk though. The foot path is easy and flat. You can take a rest any time and enjoy the green and nature.
It’s along the subway line which is very accessible – Jeongbalsan Station (Seoul Subway Line 3), Exit 2. There is a shopping/mall area before you get to the entrance of the lake. So you may take a meal before or after the walk.