Kids and adults alike can have a thrilling day at Lotte World, one of the top theme parks located 7.6 mi (12.3 km) from central Seoul. Why not take a stroll along the riverfront and watch the sunset while you're here? It's also full of great shops and restaurants, so you can spend the afternoon having a wander. If you have fun at Lotte World, you'll love KidZania, just a short walk away.
If you want to give your credit card some exercise, head out to Myeongdong Street, a popular place for shoppers in Myeong-dong. Splash some more cash at Namdaemun Market, Lotte Department Store, and Shinsegae Shopping Center.