Seoraksan is THE place to celebrate my favorite holiday. The multi-pitch trad climbing is to die for, but there's sport and bouldering as well. And aid climbing. Last year, there were almost no crowds on Chuseok, since everyone was with their families.
Let's meet at Biseondae shelter (비선대). To get there, take a bus to the city of Sokcho (속초) on Korea's East Sea. From either bus station, take the 7 or 7-1 city bus toward Seoraksan (설악산)--1000 Won. Go to the entrance for Seoraksan National Park. Pay the entrance fee (2500 Won) and follow signs up the trail/road to Biseondae shelter. It was 5000 Won per night last year, and probably still is. They have food and supplies, but a little pricey--7000 Won for bibimbap. There are blankets, but bringing your own sleeping bag is preferable.
At Seoraksan, trad is rad. Bring any and all gear you have.
See you there