4-Day Itinerary for Exploring Seoul

• Day 1: Gyeongbokgung Palace - Built-in 1395, this palace was home to the Joseon Dynasty. Visitors can admire the traditional Korean architecture and attend the changing of the guard ceremony.
  Insadong Street - A popular street for Korean culture and traditional crafts. Visitors can shop for souvenirs and try traditional foods.
  

  Estimated Time and Cost: Gyeongbokgung Palace (2-3 hours, Free), Insadong Street (2-3 hours, 50000 KRW)

• Day 2: Bukchon Hanok Village - a residential area where visitors can see some perfectly preserved traditional Korean houses known as hanoks.
  Namsan Tower - An observation deck offering a panoramic view of the city; it's a great spot to watch the sunset.

  Estimated Time and Cost: Bukchon Hanok Village (2-3 hours, Free), Namsan Tower (2-3 hours, 13,000 KRW)

• Day 3: Myeong-dong - A bustling shopping district with plenty of restaurants, street food vendors, and cosmetic stores.
  Changdeokgung Palace - A UNESCO World Heritage site featuring the Secret Garden, which is filled with traditional Korean architecture and design.

  Estimated Time and Cost: Myeong-dong (2-3 hours, Free), Changdeokgung Palace (2-3 hours, 3000 KRW)

• Day 4: Hongdae Street - Popular entertainment street with many street performers and vendors.
  Hangang River Park - A beautiful park with outdoor activities like biking, kayaking, picnicking, and stunning views of the city from the riverbanks.

  Estimated Time and Cost: Hongdae Street (2-3 hours, Free), Hangang River Park (2-3 hours, Free)

Time and Cost Estimates:

• Gyeongbokgung Palace (2-3 hours, Free)
• Insadong Street (2-3 hours, 50000 KRW)
• Bukchon Hanok Village (2-3 hours, Free)
• Namsan Tower (2-3 hours, 13,000 KRW)
• Myeong-dong (2-3 hours, Free)
• Changdeokgung Palace (2-3 hours, 3000 KRW)
• Hongdae Street (2-3 hours, Free)
• Hangang River Park (2-3 hours, Free)

Total Estimated Costs: 63,000 KRW

Transportation:

To get around Seoul, visitors need to consider using the metro, buses or taxis. Taxis are relatively affordable, and visitors should ensure they pick official taxis with meters. The metro is the most convenient mode of transportation, with an extensive network that covers many areas of the city. Visitors can purchase T-money or Cash Bee cards, which are prepaid, rechargeable smart cards for use on the metro.

Estimated costs:

• Taxi: 2500 KRW - 5000 KRW per km
• Metro: 1250 KRW per ride

Travel time varies depending on the mode of transportation and location.

Useful Tips:

If visitors have more time, they can explore some great museums like The National Museum of Korea or The War Memorial of Korea. For those with less time, they can shorten the trip to only 3-days and skip visiting Hongdae street and Hangang River Park. Visitors should carry cash as some shops and restaurants do not accept credit cards.

Airports:

Seoul has two airports: Incheon International Airport(ICN) and Gimpo International Airport (GMP). ICN is the larger and more popular airport, while GMP is used mainly for domestic flights. ICN is about 50km away from the city center, and visitors can take the subway, bus, or taxi to reach their destination. GMP is about 15km away from the city center, and visitors can also use the subway, bus, or taxi to reach their destination.