Not as well known as the popular Cheonggyecheon stream, it is the perfect stream for a run, or just a relaxed afternoon in the Gangnam neighborhood of Seoul. Unlike the previously mentioned, Yangjaecheon is a natural (real) one, and it comes from the Han river. It is 15,6km long and it has a bike path. On weekend evenings, it is frequent to see live performances of less known local artists or just talented people who share their talents with the local community.
Address
648-2 Gaepo 1(il)-dong, Gangnam-gu, Seoul, South Korea
Nice and calm, there's always activity but not too crowded. I missed the cherry blossom time because I was on a trip, but I saw pictures and it looks amazing!