On a Saturday morning, we went for a short hike to Achasan. It is part of the Seoul Trail. Seoul trail is a hike around Seoul in 8 parts. I will do within this year all parts. You will find updates on my webpage.
The good part on the Achasan tour is that you are flexible in terms of length since there are several points to go down and catch a subway and the view on the city is great!
Please enjoy the photos.