Children's Grand Park 
Many opportunities for entertainment can be found at this park. It contains a zoo, an ice rink,a greenhouse, showing a puppet play. There will be many things to do at this park madespecifically for the enjoyment of children.
Open : daily 09:00-20:00 (09:00-21:00 Sat. & Sun.)
Admission fee : adult 900 won/ children 500 won
Information: (02)450-9311 (in Korean)
Address : 18 Neung-dong, Gwangjin-gu, Seoul
How to go : exit #, Children's Grand Park station(726) on Olive #7 line 

Everland ★★★
An amusement park with a zoo and a variety of rides that range for children to adults. High speed roller coasters are a common site as are smooth rides for the young ones. For those who are more into wild life they can have an enjoyable time at the zoo, also within the same area.
Open : daily 09:30-23:00 
Admission fee : adult 11,000 won/ children 8,000 won
Information: (0335)20-8147
Address : 310 Jeondae-ri, Pokog-myeon, Yongin City, Gyeonggi-do
How to go : shuttle bus available (3141-8500 in Korean) every 30 min. till 14:00 at Sinchon station(40) on Green #2 line 

Lotte World ★★
Lotte world is a mammoth indoor and outdoor amusement park, equipped with a big scale of modern rides. It is also connected to a shopping mall, department stores, a super deluxe hotel and a sports complex. The folk village located on the third floor is a true living reproduction of Korea's ancient culture and lifestyle from days gone by. 
Open : daily 09:30-23:00 
Admission fee : adult 9,000 won/ children 7,000 won
Information : (02)411-3417(English)/ 411-3419(Japanese)
How to go : exit #3 or 4, Jamsil station(16) on Green #2 line 

Seoul Land ★★
Adjacent to the Seoul Grand Park, this is an exciting amusement park, divided into five sections called the Plaza, Samcholli Garden, Future Land, Fantasy Land and Adventure Land. Included is amovie of all the great kiss scenes, a draft beer party and a late night laser show with fireworks nightly.
Open : daily 09:30-21:00 
Admission fee : adult 5,000 won/ children 2,000-3,500 won
Information : (02)504-0011 (in Korean)
Address : 33 Makgye-dong, Gwacheon City, Gyeonggi-do
How to go : take a shuttle bus at Seoul Grand Park station on Blue #4 line 

Seoul Grand Park ★★
This largest zoo in Korea, located on a 660㎡ plain, hosts a large variety of animals from Africa,Australia, South America and local climate. There is also a botanical garden with full of tropical plants and bird life. Nearby, you will find the National Museum of Contemporary Art and Seoul Land Amusement Park and the Seoul Race track.
Open : daily 09:00-19:00 
Admission fee : adult 1,500 won/ children 1,200 won
Information: (02)500-7010 (in Korean)
Address : 159-1 Makgye-dong, Gwachun City, Gyeonggi-do
How to go : take a shuttle bus at Seoul Grand Park station on Blue #4 line 

63 Building Aquarium 
This building boasts many different types of sealife within the confines of 2 floors, specially 1st. & 2nd. floor of the basement floors. It holds daily penguin and seal shows. There are other spectacles that await within each tank of this great aquarium.
Open : daily 10:00-20:30 
Admission fee : adult 8,000 won/ children 6,200 won
Information: (02)789-5878 (in Korean)
How to go : about 1,000m Southeast from Youinaru station(527) on Purple #5 line 

Pacific Land 
This marine/aquarium park located on the island of Jeju displays the spectacles of the seas. It holds daily live dolphin and sea lion shows. To add to these exhibitions there are also vast varieties of sea life that this park has to offer to the public.
Open : daily 11:30-17:00
Admission fee : adult 5,000 won/ children 2,000 won
Information: (064)38-2888 (in Korean)
How to go : takes about 45 minutes by limousine bus at 
Jeju International Airport and off at Jungmun Tourism Area, located at Southern part of Cheju Island. Then, take a walk about 10 minutes.