Citizen's Forest ★★
The wooden park, over 258,992㎡ with a various of trees, has Patriot Yun Bong Kil's Memorial Hall, an Open-air stage, outdoor wedding halls and sport facilities, includung volleyball, tennis and shuttlecock courts.
Open : daily 24 hours
Admission fee : free
Information : (02)575-3895 (in Korean)
How to go : about 1.5km South from exit #7, Yangjae station(32) on Orange #3 line 

Olympic Park ★★★
It contains the World Peace Gate, the remains of the Mongchon Earthen Fortress, lakes,sculptures and music fountains. All located on an area of 1,670,000㎡. It's main attraction isthe Open-air Sculpture Park with 197 sculptures donated by famous artists from 66 countries. What a wonderful place for a picnic!
Open: daily 08:00-18:00
Admission fee : free (Parking fee 3,000-5,000 won/day)
Information: (02)410-1360 (in Korean)
How to go : connected directly to Olympic Park station(555) on Purple #5 line 

Boramae Park ★
This park, the old site of Korean Air Force Academy, have lawn playgrounds, ponds, a swimming pool, tennis courts, two gymnasiums, and a small zoo. Also, three aircrafts including fighter planes are on display.
Open : daily 24 hours
Admission fee : free
Information: (02)832-0102(in Korean)
How to go : about 700m Northeast from exit #4, Shindaebang station(31) on Green #2 line

Sajik Park ★
Sajikdan is a stone altar, which was erected by King Taejo in 1394 along with palaces andshrines in his new capital, today's Seoul. This park contains Tangun Hall and the Jongno Municipal Library. Up to the hill in the rear of the park, Hwanghakjong (Seoul Tangible Cultural Asset No. 25) and an archery range are located.
Open : daily 24 hours
Admission fee : free
Information: (02) 731-0536 (in Korean)
How to go : about 600m West from exit #1, Gyeongbokgung station(17) on Orange #3 line

Seokchon Lakeside Park ★

Here you can enjoy high quality traditional Korean performances including mask dances, farm,music, recreation, songs and plays. Competitive performances of every sort, such as farmmusic performance (Pungmul nori), mask dances of high school students and Madang nori ofcollege students will serve to help expand understanding about Korean cultural traditions.
Open : daily 24 hours
Admission fee : free (Parking fee 3,000-5,000 won/day)
Information: (02)415-3595 (in Korean)
How to go : about 500m South from exit #3 or 4, Jamsil station(16) on Green #2 line
just behind Southside of Lotte World Department Store 

Yongsan Family Park ★★
The jogging course of this park is very popular for soldiers and residents who live in Yongsan. 
Open : daily 24hours
Admission fee : free (Parking fee 10,000won/day)
Information : (02)792-5661 (in Korean)
How to go : about 700m East or taxi from exit #2, Ichon station(30) on Blue #4 line