nothing much too see here.. but well you can see incheon port from the observation pavillion here
You can use exercise equipments here. Go to observation tower to get view of the port. You can also see the port view from open area in front of General MacArthur Statue. If you're lucky, you can watch music performance there
Jayu park is well known for beauty of night-view. Especially for couple.
And they plant a plenty of flowers so that it would good condition to take a picture.