One great thing about Seoul is the variety of gyms available. B.Bloc in Gangnam is a popular rock climbing gym that brings the outdoors to you. Climbers of any level are welcome and the gym features a mix of easy and difficult boulders. There is a clear grading system that marks each boulder according to its level of difficulty.Since the monthly membership fees can be pricey, B.Bloc offers a one-day pass for 20,000 KRW. However, it’s important to note that climbing boots are not provided for one-day pass holders. On the bright side, you can host a birthday party for anywhere from 10 to 30 people. A 2-hour birthday party will cost 30,000 KRW.